muni4 -- Converted by SEC Publisher, created by BCL Technologies Inc., for SEC Filing

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-CSRS

CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT
INVESTMENT COMPANIES

Investment Company Act file number 811-07136

Name of Fund: BlackRock MuniYield Pennsylvania Insured Fund (MPA)

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: Donald C. Burke, Chief Executive Officer, BlackRock
MuniYield Pennsylvania Insured Fund, 800 Scudders Mill Road, Plainsboro, NJ, 08536.
Mailing address: P.O. Box 9011, Princeton, NJ, 08543-9011

Registrant’s telephone number, including area code: (800) 882-0052, Option 4

Date of fiscal year end: 10/31/2008

Date of reporting period: 11/01/2007 – 04/30/2008

Item 1 – Report to Stockholders



EQUITIES FIXED INCOME REAL ESTATE LIQUIDITY ALTERNATIVES BLACKROCK SOLUTIONS

Semi-Annual Report

APRIL 30, 2008 | (UNAUDITED)

BlackRock MuniYield Florida Insured Fund (MFT)

BlackRock MuniYield Michigan Insured Fund, Inc. (MIY)

BlackRock MuniYield New Jersey Insured Fund, Inc. (MJI)

BlackRock MuniYield Pennsylvania Insured Fund (MPA)

NOT FDIC INSURED

MAY LOSE VALUE

NO BANK GUARANTEE


Table of Contents     

 
 
    Page 

 
 
A Letter to Shareholders    3 
Semi-Annual Report:     
Fund Summaries    4 
The Benefits and Risks of Leveraging    8 
Swap Agreements    8 
Financial Statements:     
       Schedules of Investments    9 
       Statements of Assets and Liabilities    22 
       Statements of Operations    23 
       Statements of Changes in Net Assets    24 
Financial Highlights    26 
Notes to Financial Statements    30 
Officers and Trustees or Directors    36 
Additional Information    37 

2 SEMI-ANNUAL REPORT

APRIL 30, 2008


A Letter to Shareholders

Dear Shareholder

Over the past several months, financial markets have been buffeted by the housing recession, the credit market unraveling

and related liquidity freeze and steadily rising commodity prices. Counterbalancing these difficulties were booming export

activity, a robust non-financial corporate sector and, notably, aggressive and timely monetary and fiscal policy actions.

Amid the market tumult, the Federal Reserve Board (the “Fed”) intervened with a series of moves to bolster liquidity and

ensure financial market stability. Since September 2007, the central bank slashed the target federal funds rate 325 basis

points (3.25%), bringing the rate to 2.0% as of period-end. Of greater magnitude, however, were the Fed’s other policy

decisions, which included opening the discount window directly to broker dealers and investment banks and backstopping

the unprecedented rescue of Bear Stearns.

The Fed’s response to the financial crisis helped to improve credit conditions and investor mood. After hitting a low point

on March 17 (coinciding with the collapse of Bear Stearns), equity markets found a welcome respite in April, when the

S&P 500 Index of U.S. stocks posted positive monthly performance for the first time since October 2007. International

markets, which outpaced those of the U.S. for much of 2007, saw a reversal in that trend, as effects of the credit crisis and

downward pressures on growth were far-reaching.

In contrast to equity markets, Treasury securities rallied (yields fell as prices correspondingly rose), as a broad “flight-

to–quality” theme persisted. The yield on 10-year Treasury issues, which touched 5.30% in June 2007 (its highest level

in five years), fell to 4.04% by year-end and to 3.77% by April 30. Treasury issues relinquished some of their gains in April,

however, as investor appetite for risk returned and other high-quality fixed income sectors outperformed.

Problems within the monoline insurance industry and the failure of auctions for auction rate securities plagued the

municipal bond market, driving yields higher and prices lower across the curve. However, in conjunction with the more

recent shift in sentiment, the sector delivered strong performance in the final month of the reporting period.

Overall, the major benchmark indexes generated results that generally reflected heightened investor risk aversion:

Total Returns as of April 30, 2008    6-month    12-month 

 
 
U.S. equities (S&P 500 Index)    9.64%    4.68% 

 
 
 
 
Small cap U.S. equities (Russell 2000 Index)    –12.92    –10.96 

 
 
International equities (MSCI Europe, Australasia, Far East Index)    9.21    1.78 

 
 
 
 
Fixed income (Lehman Brothers U.S. Aggregate Index)    + 4.08    + 6.87 

 
 
 
 
Tax-exempt fixed income (Lehman Brothers Municipal Bond Index)    + 1.47    + 2.79 

 
 
 
 
High yield bonds (Lehman Brothers U.S. Corporate High Yield 2% Issuer Capped Index)    0.73    0.80 

 
 
 
 

  Past performance is no guarantee of future results. Index performance shown for illustrative purposes only. You cannot invest directly in an index.

As you navigate today’s volatile markets, we encourage you to review your investment goals with your financial professional

and to make portfolio changes, as needed. For more up-to-date commentary on the economy and financial markets, we

invite you to visit www.blackrock.com/funds. As always, we thank you for entrusting BlackRock with your investment assets,

and we look forward to continuing to serve you in the months and years ahead.


THIS PAGE NOT PART OF YOUR FUND REPORT



Fund Summary as of April 30, 2008 (Unaudited) BlackRock MuniYield Florida Insured Fund

Investment Objective

BlackRock MuniYield Florida Insured Fund (MFT) seeks to provide shareholders with as high a level of current income
exempt from federal income taxes as is consistent with its investment policies and prudent investment management by
investing primarily in a portfolio of long-term, investment grade municipal obligations the interest on which, in the opinion of
bond counsel to the issuers, is exempt from federal income taxes and which enables shares of the Fund to be exempt from
Florida intangible personal property taxes.

Performance

For the six months ended April 30, 2008, the Fund returned –0.79% based on market price, with dividends reinvested. The
Fund’s return based on net asset value (“NAV”) was –1.26%, with dividends reinvested. For the same period, the closed-end Lip-
per Florida Municipal Debt Funds category posted an average return of –1.18% on a NAV basis. Problems within the monoline
insurance industry had a negative impact on the entire insured municipal market, detracting from Fund performance for the
period. Exposure to uninsured hospital and single-family housing bonds also hindered results. Conversely, the Fund’s overweight
in pre-refunded bonds benefited performance, as the yield curve steepened and shorter-maturity issues outperformed.

Fund Information

Symbol on New York Stock Exchange    MFT 
Initital Offering Date    October 30, 1992 
Yield on Closing Market Price as of April 30, 2008 ($12.32)*    5.21% 
Tax Equivalent Yield**    8.02% 
Current Monthly Distribution per Common Share***    $0.0535 
Current Annualized Distribution per Common Share***    $0.642 
Leverage as of April 30, 2008****    42% 

 

* Yield on closing market price is calculated by dividing the current annualized distribution per share by the closing market price.
Past performance does not guarantee future results.
** Tax equivalent yield assumes the maximum federal tax rate of 35%.
*** The distribution is not constant and is subject to change.
**** As a percentage of managed assets, which is the total assets of the Fund (including any assets attributable to Auction Market Preferred
Shares (“Preferred Stock”) and Tender Option Bond Trusts (“TOBs”) that may be outstanding) minus the sum of accrued liabilities (other
than debt representing financial leverage).


The table below summarizes the changes in the Fund’s market price and net asset value per share:

    4/30/08    10/31/07    Change    High    Low 

 
 
 
 
 
Market Price    $12.32    $12.74    (3.30%)    $13.08    $11.74 
Net Asset Value    $13.84    $14.38    (3.76%)    $14.67    $13.06 

 
 
 
 
 

The following charts show the portfolio composition and credit quality allocations of the Fund’s long-term investments:

     Portfolio Composition         

 
 
    4/30/08    10/31/07 

 
 
Lease Revenue       18%    18% 
Transportation    17    18 
Water & Sewer    14    13 
Hospital    14    13 
City, County & State    11    9 
Education    10    11 
Housing    6    6 
Power    5    5 
Tax Revenue    4    6 
Industrial & Pollution Control    1    1 

 
 

     Credit Quality Allocations*         

 
 
Credit Rating    4/30/08    10/31/07 

 
 
AAA/Aaa    75%    91% 
AA/Aa    6    2 
A/A    15    5 
BBB/Baa    4    2 

 
 

* Using the higher of Standard & Poor’s or Moody’s Investor
Service ratings.

4 SEMI-ANNUAL REPORT APRIL 30, 2008


Fund Summary as of April 30, 2008 (Unaudited) BlackRock MuniYield Michigan Insured Fund, Inc.

Investment Objective

BlackRock MuniYield Michigan Insured Fund, Inc. (MIY) seeks to provide shareholders with as high a level of current
income exempt from federal income tax and Michigan income taxes as is consistent with its investment policies and
prudent investment management by investing primarily in a portfolio of long-term municipal obligations the interest on
which, in the opinion of bond counsel to the issuers, is exempt from federal income tax and Michigan income taxes.

Performance

For the six months ended April 30, 2008, the Fund returned +2.50% based on market price, with dividends reinvested. The Fund’s
return based on NAV was +0.27%, with dividends reinvested. For the same period, the closed-end Lipper Michigan Municipal
Debt Funds category posted an average return of –1.11% on a NAV basis. During the period, the Fund maintained an overweight
position in uninsured issues, which underperformed amid continued widening in credit spreads. However, the incremental income
generated by these holdings continued to enhance the Fund’s above-average dividend yield, which had an overall positive impact
on performance for the period.

Fund Information

Symbol on New York Stock Exchange    MIY 
Initital Offering Date    October 30, 1992 
Yield on Closing Market Price as of April 30, 2008 ($13.38)*    5.29% 
Tax Equivalent Yield**    8.14% 
Current Monthly Distribution per share of Common Stock***    $0.059 
Current Annualized Distribution per share of Common Stock***    $0.708 
Leverage as of April 30, 2008****    41% 

 

* Yield on closing market price is calculated by dividing the current annualized distribution per share by the closing market price.
Past performance does not guarantee future results.
** Tax equivalent yield assumes the maximum federal tax rate of 35%.
*** A change in the distribution rate was declared on June 2, 2008. The Monthly Distribution per Common Stock was decreased to $0.054.
The Yield on Closing Market Price, Current Monthly Distribution and Current Annualized Distribution do not reflect the new distribution rate.
The new distribution rate is not constant and is subject to further change in the future.
**** As a percentage of managed assets, which is the total assets of the Fund (including any assets attributable to Preferred Stock and TOBs
that may be outstanding) minus the sum of accrued liabilities (other than debt representing financial leverage).

The table below summarizes the changes in the Fund’s market price and net asset value per share:

    4/30/08    10/31/07    Change    High    Low 

 
 
 
 
 
Market Price    $13.38    $13.40    (0.15%)    $14.15    $12.53 
Net Asset Value    $14.68    $15.03    (2.33%)    $15.45    $13.99 

 
 
 
 
 

The following charts show the portfolio composition and credit quality allocations of the Fund’s long-term investments:

     Portfolio Composition         

 
 
    4/30/08    10/31/07 

 
 
City, County & State    19%    19% 
Industrial & Pollution Control    14    13 
Education    14    10 
Transportation    13    12 
Hospital    12    22 
Water & Sewer    12    8 
Lease Revenue    8    4 
Resource Recovery    3    7 
Housing    2    2 
Tax Revenue    2    2 
Power    1    1 

 
 

     Credit Quality Allocations*         

 
 
Credit Rating    4/30/08    10/31/07 

 
 
AAA/Aaa    68%    86% 
AA/Aa    15    3 
A/A    11    9 
BBB/Baa    5    2 
Not Rated    1     

 
 

  * Using the higher of Standard & Poor’s or Moody’s Investor
Service ratings.

SEMI-ANNUAL REPORT APRIL 30, 2008 5


Fund Summary as of April 30, 2008 (Unaudited) BlackRock MuniYield New Jersey Insured Fund, Inc.

Investment Objective

BlackRock MuniYield New Jersey Insured Fund, Inc. (MJI) seeks to provide shareholders with as high a level of current
income exempt from federal income tax and New Jersey personal income taxes as is consistent with its investment policies
and prudent investment management by investing primarily in a portfolio of long-term municipal obligations the interest on
which, in the opinion of bond counsel to the issuers, is exempt from federal income tax and New Jersey personal income taxes.

Performance

For the six months ended April 30, 2008, the Fund returned –0.76% based on market price, with dividends reinvested. The Fund’s
return based on NAV was –0.61%, with dividends reinvested. For the same period, the closed-end Lipper New Jersey Municipal
Debt Funds category posted an average return of –1.91% on a NAV basis. The Fund’s relatively neutral duration position during a
period of rising interest rates in the municipal market benefited performance versus the Lipper peer group. Additionally, the
Fund’s overall high credit quality profile enhanced performance, as credit spreads remained wide during the period.

Fund Information

Symbol on New York Stock Exchange    MJI 
Initital Offering Date    October 30, 1992 
Yield on Closing Market Price as of April 30, 2008 ($13.26)*    4.89% 
Tax Equivalent Yield**    7.52% 
Current Monthly Distribution per share of Common Stock***    $0.054 
Current Annualized Distribution per share of Common Stock***    $0.648 
Leverage as of April 30, 2008****    37% 

 

* Yield on closing market price is calculated by dividing the current annualized distribution per share by the closing market price.
Past performance does not guarantee future results.
** Tax equivalent yield assumes the maximum federal tax rate of 35%.
*** The distribution is not constant and is subject to change.
**** As a percentage of managed assets, which is the total assets of the Fund (including any assets attributable to Preferred Stock and TOBs
that may be outstanding) minus the sum of accrued liabilities (other than debt representing financial leverage).

The table below summarizes the changes in the Fund’s market price and net asset value per share:

    4/30/08    10/31/07    Change    High    Low 

 
 
 
 
 
Market Price    $13.26    $13.70    (3.21%)    $14.20    $12.66 
Net Asset Value    $14.56    $15.02    (3.06%)    $15.47    $13.64 

 
 
 
 
 

The following charts show the portfolio composition and credit quality allocations of the Fund’s long-term investments:

     Portfolio Composition         

 
 
    4/30/08    10/31/07 

 
 
City, County & State    19%    18% 
Education    18    18 
Transportation    17    19 
Hospital    11    6 
Lease Revenue    10    10 
Water & Sewer    10    9 
Industrial & Pollution Control    8    8 
Housing    3    5 
Tax Revenue    2    5 
Tobacco    1    1 
Power    1    1 

 
 

     Credit Quality Allocations*         

 
 
Credit Rating    4/30/08    10/31/07 

 
 
AAA/Aaa    74%    87% 
AA/Aa    6    2 
A/A    9    6 
BBB/Baa    8    4 
BB/Baa    1    1 
Not Rated    2     

 
 

* Using the higher of Standard & Poor’s or Moody’s Investors
Service ratings.

6 SEMI-ANNUAL REPORT APRIL 30, 2008


Fund Summary as of April 30, 2008 (Unaudited) BlackRock MuniYield Pennsylvania Insured Fund

Investment Objective

BlackRock MuniYield Pennsylvania Insured Fund (MPA) seeks to provide shareholders with as high a level of current
income exempt from federal and Pennsylvania income taxes as is consistent with its investment policies and prudent
investment management by investing primarily in a portfolio of long-term municipal obligations the interest on which, in
the opinion of bond counsel to the issuers, is exempt from federal and Pennsylvania income taxes.

Performance

For the six months ended April 30, 2008, the Fund returned +0.18% based on market price, with dividends reinvested. The Fund’s
return based on NAV was –2.12%, with dividends reinvested. For the same period, the closed-end Lipper Pennsylvania Municipal
Debt Funds category posted an average return of –2.28% on a NAV basis. The comparative performance was hindered by the
Fund’s relatively longer duration, as management anticipated lower yields amid economic weakness and did not anticipate the
liquidity problems caused by the subprime mortgage crisis early in 2008. In contrast, a relatively higher yield and an overweight in
higher-quality issues benefited Fund performance.

Fund Information

Symbol on New York Stock Exchange    MPA 
Initital Offering Date    October 30, 1992 
Yield on Closing Market Price as of April 30, 2008 ($13.36)*    5.03% 
Tax Equivalent Yield**    7.74% 
Current Monthly Distribution per Common Share***    $0.056 
Current Annualized Distribution per Common Share***    $0.672 
Leverage as of April 30, 2008****    40% 

 

* Yield on closing market price is calculated by dividing the current annualized distribution per share by the closing market price.
Past performance does not guarantee future results.
** Tax equivalent yield assumes the maximum federal tax rate of 35%.
*** A change in the distribution rate was declared on June 2, 2008. The Monthly Distribution per Common Stock was decreased to $0.053.
The Yield on Closing Market Price, Current Monthly Distribution and Current Annualized Distribution do not reflect the new distribution rate.
The new distribution rate is not constant and is subject to further change in the future.
**** As a percentage of managed assets, which is the total assets of the Fund (including any assets attributable to Preferred Shares and TOBs
that may be outstanding) minus the sum of accrued liabilities (other than debt representing financial leverage).

The table below summarizes the changes in the Fund’s market price and net asset value per share:

    4/30/08    10/31/07    Change    High    Low 

 
 
 
 
 
Market Price    $13.36    $13.67    (2.27%)    $14.28    $12.73 
Net Asset Value    $14.79    $15.49    (4.52%)    $15.96    $13.93 

 
 
 
 
 

The following charts show the portfolio composition and credit quality allocations of the Fund’s long-term investments:

     Portfolio Composition         

 
 
    4/30/08    10/31/07 

 
 
City, County & State    30%    24% 
Education    16    20 
Transportation    14    14 
Water & Sewer    11    10 
Lease Revenue    10    6 
Housing    6    7 
Power    4    6 
Hospital    4    7 
Industrial & Pollution Control    3    5 
Sales Tax    2    1 

 
 

     Credit Quality Allocations*         

 
 
Credit Rating    4/30/08    10/31/07 

 
 
AAA/Aaa       65%    84% 
AA/Aa       14    5 
A/A       15    3 
BBB/Baa    6    8 

 
 

* Using the higher of Standard & Poor’s or Moody’s Investors
Service ratings.

SEMI-ANNUAL REPORT APRIL 30, 2008 7


The Benefits and Risks of Leveraging

BlackRock MuniYield Florida Insured Fund, BlackRock MuniYield
Michigan Insured Fund, Inc., BlackRock MuniYield New Jersey Insured
Fund, Inc., and BlackRock MuniYield Pennsylvania Insured Fund (each a
“Fund” and, collectively, the “Funds”) utilize leverage to seek to enhance
the yield and NAV of their Common Shares or Common Stock. However,
these objectives cannot be achieved in all interest rate environments.

To leverage, the Funds issue Preferred Shares or Stock, which pay divi-
dends at prevailing short-term interest rates, and invest the proceeds in
long-term municipal bonds. The interest earned on these investments is
paid to Common Shareholders or Common Stock Shareholders in the
form of dividends, and the value of these portfolio holdings is reflected
in the per share net asset value of each Fund’s Common Shares or
Stock. However, in order to benefit Common Shareholders or Common
Stock shareholders, the yield curve must be positively sloped; that is,
short-term interest rates must be lower than long-term interest rates. At
the same time, a period of generally declining interest rates will benefit
Common Shareholders or Common Stock shareholders. If either of these
conditions change, then the risks of leveraging will begin to outweigh
the benefits.

To illustrate these concepts, assume a fund’s Common Shares or Stock
capitalization of $100 million and the issuance of Preferred Shares or
Stock for an additional $50 million, creating a total value of $150 mil-
lion available for investment in long-term municipal bonds. If prevailing
short-term interest rates are approximately 3% and long-term interest
rates are approximately 6%, the yield curve has a strongly positive
slope. The fund pays dividends on the $50 million of Preferred Shares or
Stock based on the lower short-term interest rates. At the same time, the
fund’s total portfolio of $150 million earns the income based on long-
term interest rates.

In this case, the dividends paid to Preferred Shareholders or Preferred
Stock shareholders are significantly lower than the income earned
on the fund’s long-term investments, and therefore the Common
Shareholders or Common Stock shareholders are the beneficiaries
of the incremental yield. However, if short-term interest rates rise, nar-
rowing the differential between short-term and long-term interest rates,
the incremental yield pickup on the Common Shares or Stock will be
reduced or eliminated completely. At the same time, the market value of

the fund’s Common Shares or Stock (that is, its price as listed on the
New York Stock Exchange) may, as a result, decline. Furthermore, if long-
term interest rates rise, the Common Shares’ or Stock’s NAV will reflect
the full decline in the price of the portfolio’s investments, since the value
of the fund’s Preferred Shares or Stock does not fluctuate. In addition to
the decline in NAV, the market value of the fund’s Common Shares or
Stock may also decline.

In addition, the Funds may from time to time leverage their assets
through the use of tender option bond (“TOB”) programs. In a typical
TOB program, the Fund transfers one or more municipal bonds to a TOB
trust which issues short-term variable rate securities to third-party
investors and a residual interest to the Fund. The cash received by the
TOB trust from the issuance of the short-term securities (less transaction
expenses) is paid to the Fund, which invests the cash in additional port-
folio securities. The distribution rate on the short-term securities is reset
periodically (typically every seven days) through a remarketing of the
short-term securities. Any income earned on the bonds in the TOB trust,
net of expenses incurred by the TOB trust, that is not paid to the holders
of the short-term securities is paid to the Fund. In connection with man-
aging the Funds’ assets, the Funds’ investment advisor may at any time
retrieve the bonds out of the TOB trust typically within seven days. TOB
investments generally will provide the Fund with economic benefits in
periods of declining short-term interest rates, but expose the Fund to
risks during periods of rising short-term interest rates similar to those
associated with Preferred Shares or Stock issued by the Fund, as
described above. Additionally, fluctuations in the market value of
municipal securities deposited into the TOB trust may adversely affect
the Funds’ NAVs per share. (See Note 1 of the Notes to Financial
Statements for details of municipal bonds transferred to TOB trusts.)

Under the Investment Company Act of 1940, the Funds are permitted
to issue Preferred Shares or Stock in an amount of up to 50% of their
total managed assets at the time of issuance. Each Fund also antici-
pates that its total economic leverage will not exceed 50% of its total
managed assets. Economic leverage includes Preferred Shares or Stock
and TOBs. As of April 30, 2008, BlackRock MuniYield Florida Insured
Fund, BlackRock MuniYield Michigan Insured Fund, Inc., BlackRock
MuniYield New Jersey Insured Fund, Inc. and BlackRock MuniYield
Pennsylvania Insured Fund, had economic leverage of 42%, 41%,
37% and 40% of managed assets, respectively.

Swap Agreements

The Funds may invest in swap agreements, which are over-the-counter
contracts in which one party agrees to make periodic payments based
on the change in market value of a specified bond, basket of bonds, or
index in return for periodic payments based on a fixed or variable inter-
est rate or the change in market value of a different bond, basket of
bonds or index. Swap agreements may be used to obtain exposure to a

bond or market without owning or taking physical custody of securities.
Swap agreements involve the risk that the party with whom each Fund
has entered into a swap will default on its obligation to pay the Fund
and the risk that the Fund will not be able to meet its obligation to pay
the other party to the agreement.

8 SEMI-ANNUAL REPORT

APRIL 30, 2008


Schedule of Investments April 30, 2008 (Unaudited) BlackRock MuniYield Florida Insured Fund

(Percentages shown are based on Net Assets)

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Florida — 142.2%         

 
 
 
Alachua County, Florida, School Board, COP,         
 5.25%, 7/01/29 (a)    $ 1,300    $ 1,311,479 

 
 
Boynton Beach, Florida, Utility System Revenue         
 Refunding Bonds, 6.25%, 11/01/20 (b)(c)    700    817,915 

 
 
Brevard County, Florida, Health Facilities Authority,         
 Healthcare Facilities Revenue Bonds (Health         
 First Inc. Project), 5%, 4/01/36    2,000    1,863,440 

 
 
Broward County, Florida, Educational Facilities         
 Authority Revenue Bonds (Nova Southeastern         
 University), 5%, 4/01/31 (d)    1,720    1,748,036 

 
 
Broward County, Florida, HFA, S/F Mortgage         
 Revenue Refunding Bonds, AMT, Series E,         
 5.90%, 10/01/39 (e)(f)    1,100    1,115,345 

 
 
Daytona Beach, Florida, Utility System Revenue         
 Refunding Bonds, Series B, 5%, 11/15/27 (c)    1,000    1,016,420 

 
 
Deltona, Florida, Transportation Capital Improvement         
 Revenue Bonds, 5.125%, 10/01/26 (g)    1,000    1,023,640 

 
 
Emerald Coast, Florida, Utilities Authority, System         
 Revenue Bonds, 5.25%, 1/01/36 (c)    1,000    1,024,010 

 
 
Flagler County, Florida, Capital Improvement Revenue         
 Bonds, 5%, 10/01/35 (g)    1,000    1,007,350 

 
 
Florida HFA, Housing Revenue Bonds (Brittany         
 Rosemont Apartments), AMT, Series C-1,         
 6.75%, 8/01/14 (a)    975    976,238 

 
 
Florida Housing Finance Corporation, Homeowner         
 Mortgage Revenue Bonds, AMT:         
     Series 1, 6%, 7/01/39    500    506,275 
     Series 11, 5.95%, 1/01/32 (h)    1,530    1,539,256 

 
 
Florida Housing Finance Corporation, Homeowner         
 Mortgage Revenue Refunding Bonds, AMT, Series 4,         
 6.25%, 7/01/22 (h)    315    329,263 

 
 
Florida State Board of Education, Capital Outlay, GO,         
 Public Education, Series B, 5%, 6/01/31 (c)    1,000    1,014,750 

 
 
Florida State Board of Education, Lottery Revenue         
 Bonds, Series A, 6%, 7/01/10 (c)(i)    6,190    6,714,107 

 
 
Florida State Governmental Utility Authority,         
 Utility Revenue Bonds (Lehigh Utility System),         
 5.125%, 10/01/33 (a)    1,000    1,010,320 

 
 
Florida State Turnpike Authority, Turnpike Revenue         
 Bonds (Department of Transportation), Series B,         
 5%, 7/01/30    1,860    1,874,508 

 
 

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Florida (continued)         

 
 
 
Highlands County, Florida, Health Facilities Authority,         
 Hospital Revenue Bonds (Adventist Health System),         
 Series C, 5.25%, 11/15/36    $ 1,250    $ 1,219,275 

 
 
Hillsborough County, Florida, Aviation         
 Authority Revenue Bonds, AMT, Series A,         
 5.50%, 10/01/38 (d)    2,510    2,527,696 

 
 
Hillsborough County, Florida, HFA, S/F         
 Mortgage Revenue Bonds, AMT, Series 1,         
 5.375%, 10/01/49 (e)(f)    1,340    1,292,671 

 
 
Hillsborough County, Florida, IDA, Hospital Revenue         
 Bonds (H. Lee Moffitt Cancer Center Project),         
 Series A, 5.25%, 7/01/37    1,750    1,676,868 

 
 
Hillsborough County, Florida, IDA, PCR, Refunding         
 (Tampa Electric Company Project), Series B,         
 5.15%, 9/01/25    500    507,415 

 
 
Hillsborough County, Florida, School Board, COP (g):         
     5.375%, 7/01/09 (i)    6,000    6,200,160 
     5%, 7/01/29    1,000    1,008,080 

 
 
Jacksonville Electric Authority, Florida, Saint John’s         
 River Power Park System Revenue Bonds, Issue         
 Three, Series 2, 5%, 10/01/37    1,300    1,318,486 

 
 
Jacksonville, Florida, Economic Development         
 Commission, Health Care Facilities Revenue Bonds         
 (Mayo Clinic-Jacksonville) (g):         
     Series A, 5.50%, 11/15/36    1,000    1,035,690 
     Series B, 5.50%, 11/15/36    750    776,768 

 
 
Jacksonville, Florida, Economic Development         
 Commission, IDR (Metropolitan Parking Solutions         
 Project), AMT, 5.50%, 10/01/30 (j)    1,140    1,023,652 

 
 
Jacksonville, Florida, Guaranteed Entitlement         
 Revenue Refunding and Improvement Bonds,         
 5.25%, 10/01/32 (c)    1,455    1,476,679 

 
 
Jacksonville, Florida, HFA, Homeowner Mortgage         
 Revenue Refunding Bonds, AMT, Series A-1,         
 5.625%, 10/01/39 (e)(f)    1,000    994,890 

 
 
Jacksonville, Florida, Health Facilities Authority,         
 Hospital Revenue Bonds (Baptist Medical Center         
 Project), 5%, 8/15/37 (h)    2,875    2,887,506 

 
 
Jacksonville, Florida, Port Authority Revenue Bonds,         
 AMT, 6% 11/01/38 (d)    400    412,376 

 
 
Jacksonville, Florida, Port Authority, Seaport Revenue         
 Bonds, AMT, 5.625%, 11/01/26 (g)    1,225    1,235,070 

 
 
Jacksonville, Florida, Sales Tax Revenue Bonds,         
 5%, 10/01/27 (g)    1,310    1,339,881 

 
 

Portfolio Abbreviations

To simplify the listings of portfolio holdings in the
Schedules of Investments, we have abbreviated the
names and descriptions of many of the securities
according to the list on the right.

AMT    Alternative Minimum Tax (subject to)    IDA    Industrial Development Authority 
CABS    Capital Appreciation Bonds    IDR    Industrial Development Revenue Bonds 
COP    Certificates of Participation    M/F    Multi-Family 
DRIVERS    Derivative Inverse Tax-Exempt Receipts    PCR    Pollution Control Revenue Bonds 
EDA    Economic Development Authority    RIB    Residual Interest Bonds 
EDR    Economic Development Revenue Bonds    S/F    Single Family 
GO    General Obligation Bonds    SIFMA    Securities and Financial 
HDA    Housing Development Authority        Markets Association 
HFA    Housing Finance Agency    VRDN    Variable Rate Demand Notes 

See Notes to Financial Statements.

SEMI-ANNUAL REPORT

APRIL 30, 2008

9


Schedule of Investments (continued) BlackRock MuniYield Florida Insured Fund

(Percentages shown are based on Net Assets)

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Florida (continued)         

 
 
 
Lakeland, Florida, Electric and Water Revenue         
 Refunding Bonds, Series A, 5%, 10/01/28 (g)    $ 2,000    $ 2,013,020 

 
 
Lee County, Florida, Airport Revenue Bonds, AMT,         
 Series A, 6%, 10/01/29 (h)    1,000    1,031,760 

 
 
Lee County, Florida, Capital Revenue Bonds,         
 5.25%, 10/01/23 (a)    2,285    2,372,607 

 
 
Lee County, Florida, HFA, S/F Mortgage Revenue         
 Bonds (Multi-County Program), AMT, Series A-2,         
 6%, 9/01/40 (e)(f)    1,800    1,869,498 

 
 
Lee Memorial Health System, Florida, Hospital         
 Revenue Bonds, Series A, 5%, 4/01/32 (a)    2,000    2,002,760 

 
 
Leesburg, Florida, Capital Improvement Revenue         
 Bonds, 5.25%, 10/01/34 (c)    1,000    1,011,350 

 
 
Manatee County, Florida, HFA, Homeowner Revenue         
 Bonds, AMT, Series A, 5.90%, 9/01/40 (e)(f)    1,000    997,710 

 
 
Martin County, Florida, Utilities System Revenue         
 Bonds, 5.125%, 10/01/33 (a)    1,000    1,004,650 

 
 
Miami Beach, Florida, Water and Sewer Revenue         
 Bonds, 5.75%, 9/01/25 (a)    2,000    2,093,600 

 
 
Miami-Dade County, Florida, Aviation Revenue Bonds         
 (Miami International Airport), AMT, Series A,         
 6%, 10/01/24 (c)    5,000    5,102,500 

 
 
Miami-Dade County, Florida, Educational Facilities         
 Authority Revenue Bonds (University of Miami),         
 Series A, 5.75%, 4/01/10 (a)(i)    2,000    2,144,400 

 
 
Miami-Dade County, Florida, Expressway Authority,         
 Toll System Revenue Bonds, Series B (c):         
     5.25%, 7/01/27    1,000    1,012,530 
     5%, 7/01/33    3,875    3,836,405 

 
 
Miami-Dade County, Florida, HFA, Home Ownership         
 Mortgage Revenue Bonds, AMT, Series A,         
 5.55%, 10/01/49 (e)(f)    1,200    1,187,280 

 
 
Miami-Dade County, Florida, IDA, IDR (BAC         
 Funding Corporation Project), Series A,         
 5.375%, 10/01/30 (a)    1,655    1,689,126 

 
 
Miami-Dade County, Florida, School Board, COP,         
 Series A, 5.50%, 10/01/09 (h)(i)    2,000    2,090,560 

 
 
Miami-Dade County, Florida, Solid Waste System         
 Revenue Bonds, 5.25%, 10/01/30 (g)    1,865    1,893,535 

 
 
Miami-Dade County, Florida, Special Obligation         
 Revenue Bonds, Sub-Series A (g)(k):         
     5.186%, 10/01/31    4,375    1,200,150 
     5.203%, 10/01/33    5,735    1,406,623 

 
 
Orange County, Florida, Educational Facilities         
 Authority, Educational Facilities Revenue         
 Refunding Bonds (Rollins College Project),         
 5.50%, 12/01/32 (a)    4,765    4,928,868 

 
 
Orange County, Florida, Health Facilities Authority,         
 Hospital Revenue Bonds (Orlando Regional         
 Healthcare), 6%, 12/01/12 (i)    1,835    2,061,641 

 
 
Orange County, Florida, Sales Tax Revenue Refunding         
 Bonds, Series A, 5.125%, 1/01/23 (c)    1,000    1,036,010 

 
 

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Florida (continued)         

 
 
 
Orange County, Florida, School Board, COP, Series A,         
 5.25%, 8/01/09 (g)(i)    $ 6,500    $ 6,808,815 

 
 
Orange County, Florida, Tourist Development, Tax         
 Revenue Refunding Bonds, 5%, 10/01/29 (a)    2,190    2,202,045 

 
 
Orlando and Orange County, Florida, Expressway         
 Authority Revenue Bonds, Series B (a):         
     5%, 7/01/30    4,000    4,021,440 
     5%, 7/01/35    6,815    6,839,125 

 
 
Orlando, Florida, Senior Tourist Development Tax         
 Revenue Bonds (6th Cent Contract Payments),         
 Series A, 5.25%, 11/01/38 (d)    2,000    2,066,480 

 
 
Orlando-Orange County Expressway Authority, Florida,         
 Expressway Revenue Bonds, VRDN, Sub-Series D,         
 3.34%, 7/01/40 (a)(l)    3,000    3,000,000 

 
 
Osceola County, Florida, Tourist Development Tax         
 Revenue Bonds, Series A, 5.50%, 10/01/27 (c)    1,100    1,138,621 

 
 
Palm Beach County, Florida, Criminal Justice         
 Facilities Revenue Bonds, 7.20%, 6/01/15 (c)    1,500    1,839,975 

 
 
Palm Beach County, Florida, School Board, COP,         
 Refunding, Series D, 5.25%, 8/01/21 (h)    2,000    2,101,540 

 
 
Palm Beach County, Florida, School Board, COP,         
 Series A:         
     6%, 8/01/10 (c)(i)    5,000    5,416,100 
     5%, 8/01/29 (c)(g)    2,470    2,482,968 
     5%, 8/01/31 (h)    1,300    1,319,214 

 
 
Panama City, Florida, Water and Sewer Revenue         
 Bonds, Series B, 5.25%, 10/01/22 (g)    1,500    1,580,805 

 
 
Pembroke Pines, Florida, Public Improvement         
 Revenue Bonds, Series A, 5%, 10/01/34 (a)    1,000    995,600 

 
 
Polk County, Florida, Utility System Revenue Bonds,         
 5.25%, 10/01/22 (c)    1,000    1,046,440 

 
 
Port St. Lucie, Florida, Utility Revenue Bonds,         
 5.25%, 9/01/24 (g)    1,055    1,085,827 

 
 
Saint Johns County, Florida, Ponte Vedra Utility         
 System Revenue Bonds (h):         
     5%, 10/01/31    2,425    2,453,979 
     5%, 10/01/35    1,000    1,016,070 

 
 
Saint Johns County, Florida, Sales Tax Revenue         
 Bonds, Series A, 5.25%, 10/01/31 (a)    1,400    1,432,060 

 
 
Saint Lucie, Florida, West Services District, Utility         
 Revenue Bonds, 5.25%, 10/01/34 (g)    1,000    1,027,900 

 
 
Santa Rosa County, Florida, School Board, COP,         
 Refunding, Series 2, 5.25%, 2/01/26 (c)    2,000    2,038,080 

 
 
South Lake County, Florida, Hospital District         
 Revenue Bonds (South Lake Hospital Inc.),         
 5.80%, 10/01/34    1,000    1,008,460 

 
 
Tallahassee, Florida, Capital Revenue Bonds,         
 5%, 10/01/24 (h)    1,000    1,033,770 

 
 
University of Central Florida Athletics Association Inc.,         
 COP, Series A, 5.25%, 10/01/34 (c)    2,280    2,279,886 

 
 
University of Central Florida, COP (UCF Convocation         
 Center), Series A, 5%, 10/01/35 (c)    2,820    2,613,914 

 
 

See Notes to Financial Statements.

10 SEMI-ANNUAL REPORT

APRIL 30, 2008


Schedule of Investments (concluded) BlackRock MuniYield Florida Insured Fund

(Percentages shown are based on Net Assets)

        Par     
Municipal Bonds        (000)    Value 

 
 
 
 
     Florida (concluded)             

 
 
 
 
Village Center Community Development District,             
 Florida, Recreational Revenue Bonds, Series A (g):             
     5.375%, 11/01/34    $ 1,640    $ 1,699,040 
     5.125%, 11/01/36        1,000    1,021,540 

 
 
 
Village Center Community Development District,             
 Florida, Utility Revenue Bonds (g):             
     5.25%, 10/01/23        2,585    2,722,160 
     5.125%, 10/01/28        4,030    4,128,292 

 
 
 
Volusia County, Florida, IDA, Student Housing             
 Revenue Bonds (Stetson University Project),             
 Series A (m):             
     5%, 6/01/25        1,000    1,019,670 
     5%, 6/01/35        1,000    1,004,100 
           
            166,256,014 

 
 
 
 
     Puerto Rico — 1.8%             

 
 
 
 
Puerto Rico Public Buildings Authority, Government             
 Facilities Revenue Refunding Bonds, Series I,             
 5%, 7/01/36 (n)        1,000    938,240 

 
 
 
Puerto Rico Public Finance Corporation,             
 Commonwealth Appropriation Revenue Bonds,             
 Series E, 5.70%, 2/01/10 (i)        1,145    1,202,158 
           
            2,140,398 

 
 
 
Total Municipal Bonds (Cost — $166,389,038) — 144.0%        168,396,412 

 
 
 
 
 
Municipal Bonds Transferred to             
Tender Option Bond Trusts (o)             

 
 
 
 
     Florida — 15.3%             

 
 
 
 
Miami-Dade County, Florida, Aviation Revenue             
 Bonds, Airport and Marina Imports, Series A,             
 5%, 10/01/33 (h)        6,212    5,871,263 

 
 
 
Miami-Dade County, Florida, Health Facilities             
 Authority, Hospital Revenue Refunding             
 Bonds (Miami Children’s Hospital), Series A,             
 5.625%, 8/15/18 (a)        6,960    7,635,050 

 
 
 
South Broward, Florida, Hospital District, Hospital             
 Revenue Bonds, 5.625%, 5/1/32 (g)        4,000    4,430,840 
           
            17,937,153 

 
 
 
 
     Puerto Rico — 6.5%             

 
 
 
 
Puerto Rico Public Finance Corporation,             
 Commonwealth Appropriation Revenue Bonds,             
 Series A, 5.375%, 8/1/11 (g)(i)        7,100    7,592,811 

 
 
 
Total Municipal Bonds Transferred to Tender Option             
Bond Trusts (Cost — $24,807,670) — 21.8%            25,529,964 

 
 
 

Short-Term Securities    Shares    Value 

 
 
 
CMA Florida Municipal Money Fund, 2.01% (p)(q)    8,383,168    $ 8,383,168 

 
 
Total Short-Term Securities (Cost — $8,383,168) — 7.2%    8,383,168 

 
Total Investments (Cost — $199,579,876*) — 173.0%    202,309,544 
Liabilities in Excess of Other Assets — (0.9%)        (1,028,021) 
Liability for Trust Certificates, Including Interest         
   Expense and Fees Payable — (10.5%)        (12,312,207) 
Preferred Shares, at Redemption Value — (61.6%)        (72,021,645) 
       
Net Assets Applicable to Common Shares — 100.0%        $116,947,671 
   
 

  * The cost and unrealized appreciation (depreciation) of investments as of April 30,
2008, as computed for federal income tax purposes, were as follows:

Aggregate cost    $ 187,494,476 
   
Gross unrealized appreciation    $ 4,974,546 
Gross unrealized depreciation    (2,390,741) 
   
Net unrealized appreciation    $ 2,583,805 
   

(a) AMBAC Insured.
(b) Security is collateralized by municipal or U.S. Treasury obligations.
(c) FGIC Insured.
(d) Assured Guaranty Insured.
(e) FHLMC Collateralized.
(f) FNMA/GNMA Collateralized.
(g) MBIA Insured.
(h) FSA Insured.
(i) U.S. government securities, held in escrow, are used to pay interest on this
security as well as to retire the bond in full at the date indicated, typically at
a premium to par.
(j) ACA Insured.
(k) Represents a zero coupon bond. Rate shown reflects the effective yield at the
time of purchase.
(l) Variable rate security. Rate shown is interest rate as of report date. Maturity
shown is the final maturity date.
(m) CIFG Insured.
(n) Commonwealth Guaranteed.
(o) Securities represent bonds transferred to a tender option bond trust in exchange
for which the Fund acquired residual interest certificates. These securities
serve as a collateral in a financing transaction. See Note 1 of the Notes to
Financial Statements for details of municipal bonds transferred to tender
option bond trusts.
(p) Represents the current yield as of report date.
(q) Investments in companies considered to be an affiliate of the Fund, for purposes
of Section 2(a)(3) of the Investment Company Act of 1940, were as follows:

    Net    Dividend 
Affiliate    Activity    Income 

 
 
 
CMA Florida Municipal Money Fund    6,537,677    $38,375 

 
 

See Notes to Financial Statements.

SEMI-ANNUAL REPORT

APRIL 30, 2008

11


Schedule of Investments April 30, 2008 (Unaudited) BlackRock MuniYield Michigan Insured Fund, Inc.

(Percentages shown are based on Net Assets)

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Michigan — 143.7%         

 
 
 
Adrian, Michigan, City School District, GO,         
 5%, 5/01/14 (a)(b)    $ 3,600    $ 3,948,660 

 
 
Bay City, Michigan, School District, School Building         
 and Site, GO, 5%, 5/01/31 (a)    3,725    3,808,775 

 
 
Birmingham, Michigan, City School District, School         
 Building and Site, GO, 5%, 11/01/33 (a)    1,000    1,020,010 

 
 
Central Montcalm, Michigan, Public Schools, GO,         
 5.90%, 5/01/09 (b)(c)    1,000    1,037,310 

 
 
Delta County, Michigan, Economic Development         
 Corporation, Environmental Improvement Revenue         
 Refunding Bonds (Mead Westvaco-Escanaba), AMT,         
 Series B, 6.45%, 4/15/12 (b)    1,500    1,666,545 

 
 
Detroit, Michigan, City School District, GO (School         
 Building and Site Improvement):         
     Refunding, Series A, 5%, 5/01/21 (a)    3,000    3,141,900 
     Series A, 5.375%, 5/01/13 (b)(d)    2,300    2,544,122 
     Series B, 5%, 5/01/28 (d)    3,100    3,147,926 

 
 
Detroit, Michigan, Water Supply System Revenue         
 Bonds:         
     6.25%, 7/01/12 (d)(e)    1,415    1,503,777 
     DRIVERS, Series 200,         
     5.75%, 7/01/11 (b)(d)(f)    1,025    1,225,880 
     Second Lien, Series B, 5%, 7/01/13 (b)(c)    1,550    1,691,158 
     Second Lien, Series B, 5%, 7/01/34 (c)    2,420    2,426,389 
     Second Lien, Series C, 5%, 7/01/29 (a)    10,570    10,847,357 
     Senior Lien, Series A, 5.875%, 1/01/10 (b)(d)    1,250    1,333,275 
     Senior Lien, Series A, 5%, 7/01/13 (b)(c)    3,750    4,091,512 
     Senior Lien, Series A, 5%, 7/01/25 (a)    4,000    4,151,840 
     Senior Lien, Series A, 5%, 7/01/34 (c)    6,900    6,918,216 
     Series B, 5.25%, 7/01/13 (b)(c)    11,790    13,003,545 

 
 
Dickinson County, Michigan, Economic Development         
 Corporation, Environmental Improvement Revenue         
 Refunding Bonds (International Paper Company         
 Project), Series A, 5.75%, 6/01/16    3,900    3,956,355 

 
 
Dickinson County, Michigan, Healthcare         
 System, Hospital Revenue Refunding Bonds,         
 5.80%, 11/01/24 (g)    3,100    3,088,282 

 
 
East Grand Rapids, Michigan, Public School District,         
 GO, 5%, 5/01/31 (a)    1,575    1,611,493 

 
 
Eastern Michigan University, General Revenue         
 Refunding Bonds (h):         
     6%, 6/01/10 (b)    590    638,315 
     6%, 6/01/20    435    460,273 

 
 
Eastern Michigan University Revenue Bonds,         
 Series B (b)(d):         
     5.60%, 6/01/10    1,500    1,594,230 
     5.625%, 6/01/10    1,310    1,392,949 

 
 
Eaton Rapids, Michigan, Public Schools, School         
 Building and Site, GO (a):         
     5%, 5/01/14 (b)    2,425    2,659,861 
     5.25%, 5/01/20    1,325    1,424,030 
     5.25%, 5/01/21    1,675    1,789,135 
     5%, 5/01/26    1,700    1,746,070 
     5%, 5/01/29    1,175    1,198,794 

 
 

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Michigan (continued)         

 
 
 
Flint, Michigan, Hospital Building Authority, Revenue         
 Refunding Bonds (Hurley Medical Center),         
 Series A (g):         
     5.375%, 7/01/20    $ 615    $ 564,884 
     6%, 7/01/20    1,375    1,334,479 

 
 
Frankenmuth, Michigan, School District, GO,         
 5.75%, 5/01/10 (b)(d)    1,000    1,064,920 

 
 
Gibraltar, Michigan, School District, GO (School         
 Building and Site) (d):         
     5%, 5/01/14 (b)    2,940    3,224,739 
     5%, 5/01/28    710    722,141 

 
 
Grand Blanc, Michigan, Community Schools, GO,         
 5.625%, 5/01/20 (d)    1,100    1,157,882 

 
 
Grand Rapids, Michigan, Building Authority Revenue         
 Bonds, Series A (h):         
     5.50%, 10/01/12 (b)    1,035    1,143,582 
     5.50%, 10/01/19    665    708,903 
     5.50%, 10/01/20    900    959,418 

 
 
Grand Valley State University, Michigan, Revenue         
 Bonds, 5.50%, 2/01/18 (d)    2,070    2,210,242 

 
 
Greater Detroit Resource Recovery Authority,         
 Michigan, Revenue Refunding Bonds, Series A,         
 6.25%, 12/13/08 (h)    11,250    11,528,437 

 
 
Gull Lake, Michigan, Community School District,         
 School Building and Site, GO, 5%, 5/01/14 (a)(b)    5,625    6,169,781 

 
 
Harper Woods, Michigan, City School District, School         
 Building and Site, GO, Refunding (d):         
     5%, 5/01/14 (b)    4,345    4,765,813 
     5%, 5/01/34    430    436,678 

 
 
Hartland, Michigan, Consolidated School District, GO,         
 6%, 5/01/10 (b)(d)    6,825    7,301,249 

 
 
Hudsonville, Michigan, Public Schools, School         
 Building and Site, GO, 5%, 5/01/29 (a)    3,990    4,070,797 

 
 
Jenison, Michigan, Public Schools, School Building         
 and Site, GO, 5.50%, 5/01/19 (d)    1,575    1,657,420 

 
 
Kent, Michigan, Hospital Finance Authority, Hospital         
 Revenue Refunding Bonds (Butterworth Hospital),         
 Series A, 7.25%, 1/15/13 (c)    3,365    3,711,225 

 
 
Kent, Michigan, Hospital Finance Authority         
 Revenue Bonds (Spectrum Health), Series A,         
 5.50%, 7/15/11 (b)(c)    3,000    3,266,850 

 
 
Lansing, Michigan, Building Authority, GO, Series A,         
 5.375%, 6/01/13 (b)(c)    1,510    1,672,325 

 
 
Lapeer, Michigan, Community Schools, School         
 Building and Site, GO, 5%, 5/01/37 (a)    2,015    2,064,408 

 
 
Michigan Higher Education Facilities Authority, Limited         
 Obligation Revenue Bonds (Hillsdale College         
 Project), 5%, 3/01/35    1,875    1,810,425 

 
 
Michigan Higher Education Facilities Authority, Limited         
 Obligation Revenue Refunding Bonds (Hope         
 College), Series A, 5.90%, 4/01/32    2,250    2,255,310 

 
 

See Notes to Financial Statements.

12 SEMI-ANNUAL REPORT

APRIL 30, 2008


Schedule of Investments (continued) BlackRock MuniYield Michigan Insured Fund, Inc.

(Percentages shown are based on Net Assets)

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Michigan (continued)         

 
 
 
Michigan Higher Education Facilities Authority,         
 Revenue Refunding Bonds (College for Creative         
 Studies):         
     5.85%, 12/01/22    $ 1,235    $ 1,259,601 
     5.90%, 12/01/27    1,145    1,161,912 

 
 
Michigan Higher Education Student Loan Authority,         
 Student Loan Revenue Bonds, AMT (h):         
     Series XVII-B, 5.40%, 6/01/18    2,500    2,515,175 
     Series XVII-Q, 5%, 3/01/31    3,000    2,776,680 

 
 
Michigan Municipal Bond Authority Revenue Bonds         
 (Local Government Loan Program), Group A,         
 5.50%, 11/01/20 (i)    1,065    1,113,798 

 
 
Michigan State Building Authority, Revenue Refunding         
 Bonds (Facilities Program):         
     RIB, Series 517X, 8.29%, 10/15/10 (a)    1,250    1,447,900 
     Series I, 5.50%, 10/15/18 (c)    2,500    2,646,450 
     Series II, 5%, 10/15/29 (c)    3,500    3,531,500 

 
 
Michigan State, COP (h):         
     5.50%, 6/01/10 (b)    3,000    3,186,810 
     5.40%, 6/01/22 (e)(i)    3,000    1,567,890 

 
 
Michigan State, Comprehensive Transportation         
 Revenue Refunding Bonds, 5%, 5/15/26 (a)    3,740    3,872,583 

 
 
Michigan State, HDA, Limited Obligation M/F Housing         
 Revenue Bonds (Deaconess Towers Apartments),         
 AMT (j):         
     4.75%, 4/20/37    4,050    3,580,362 
     5.25%, 2/20/48    1,000    934,290 

 
 
Michigan State, HDA, Rental Housing Revenue         
 Bonds, AMT:         
     Series A, 5.30%, 10/01/37 (c)    200    191,108 
     Series D, 5%, 4/01/26 (a)    3,310    3,184,750 

 
 
Michigan State Hospital Finance Authority Revenue         
 Bonds:         
     (McLaren Health Care Corporation), Series C,         
     5%, 8/01/35    1,000    935,080 
     (Mid-Michigan Obligor Group), Series A,         
     5%, 4/15/36    1,750    1,647,152 

 
 
Michigan State Hospital Finance Authority, Hospital         
 Revenue Bonds (Mid-Michigan Obligation Group),         
 Series A, 5.50%, 4/15/18 (h)    2,530    2,641,801 

 
 
Michigan State Hospital Finance Authority, Hospital         
 Revenue Refunding Bonds:         
     (Crittenton Hospital), Series A, 5.625%, 3/01/27    2,200    2,240,304 
     (Oakwood Obligated Group), Series A,         
     5%, 7/15/25    1,125    1,117,215 
     (Oakwood Obligated Group), Series A,         
     5%, 7/15/37    630    591,368 
     (Sparrow Obligated Group), 5%, 11/15/31    4,100    3,983,888 

 
 

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Michigan (continued)         

 
 
 
Michigan State Hospital Finance Authority, Revenue         
 Refunding Bonds:         
     (Ascension Health Credit), Series A,         
     5.75%, 11/15/09 (b)(c)    $ 2,715    $ 2,879,936 
     (Ascension Health Credit), Series A,         
     6.25%, 11/15/09 (b)(c)    2,500    2,670,700 
     (Henry Ford Health System), Series A,         
     5.25%, 11/15/46    2,500    2,407,300 
     (Mercy Health Services), Series X,         
     6%, 8/15/09 (b)(c)    2,000    2,094,360 
     (Saint John Hospital), Series A,         
     6%, 5/15/13 (e)(h)    3,000    3,043,260 
     (Trinity Health Credit Group), Series D,         
     5%, 8/15/34    3,100    3,059,576 
     (Trinity Health Credit), Series C,         
     5.375%, 12/01/23    1,000    1,025,030 
     (Trinity Health Credit), Series C,         
     5.375%, 12/01/30    3,755    3,813,428 
     (Trinity Health), Series A, 6%, 12/01/27 (h)    6,400    6,788,480 

 
 
Michigan State Strategic Fund, Limited Obligation         
 Revenue Refunding Bonds:         
     (Detroit Edison Company Pollution Control         
     Project), AMT, Series A, 5.55%, 9/01/29 (c)    10,250    10,292,435 
     (Detroit Edison Company Pollution Control         
     Project), Series AA, 6.95%, 5/01/11 (d)    6,000    6,602,640 
     (Dow Chemical Company Project), AMT,         
     5.50%, 12/01/28    2,175    2,169,650 

 
 
Monroe County, Michigan, Economic Development         
 Corporation, Limited Obligation Revenue         
 Refunding Bonds (Detroit Edison Co. Project),         
 Series AA, 6.95%, 9/01/22 (d)    15,000    18,949,200 

 
 
Montrose Township, Michigan, School District, GO,         
 6.20%, 5/01/17 (c)    1,000    1,177,950 

 
 
Muskegon Heights, Michigan, Water System Revenue         
 Bonds, Series A, 5.625%, 11/01/10 (b)(c)    1,830    1,966,793 

 
 
Northview, Michigan, Public School District, GO,         
 Refunding, 5.80%, 5/01/21 (c)    235    235,024 

 
 
Norway Vulcan, Michigan, Area Schools, GO,         
 5.90%, 5/01/09 (b)(d)    1,100    1,142,042 

 
 
Oak Park, Michigan, Street Improvement, GO,         
 5%, 5/01/30 (c)    500    505,585 

 
 
Orchard View, Michigan, Schools, School Building         
 and Site, GO, 5%, 11/01/13 (b)(c)    5,320    5,831,412 

 
 
Pennfield, Michigan, School District, School         
 Building and Site, GO, 5%, 5/01/14 (b)(d)    1,370    1,502,684 

 
 
Plainwell, Michigan, Community Schools,         
 School District, School Building and Site, GO,         
 5.50%, 11/01/12 (a)(b)    1,000    1,106,790 

 
 
Plymouth-Canton, Michigan, Community School         
 District, GO, 5%, 5/01/29 (d)    3,905    3,975,876 

 
 
Portage, Michigan, Public Schools, School Building         
 and Site, GO, 5%, 5/01/31 (a)    4,650    4,786,524 

 
 

See Notes to Financial Statements.

SEMI-ANNUAL REPORT

APRIL 30, 2008

13


Schedule of Investments (continued) BlackRock MuniYield Michigan Insured Fund, Inc.

(Percentages shown are based on Net Assets)

        Par     
Municipal Bonds        (000)    Value 

 
 
 
 
     Michigan (concluded)             

 
 
 
 
Reed, Michigan, City Public Schools, School             
 Building and Site, GO, 5%, 5/01/14 (a)(b)    $ 1,425    $ 1,563,011 

 
 
Roseville, Michigan, School District, School             
 Building and Site, GO, Refunding,             
 5%, 5/01/31 (a)        1,500    1,533,735 

 
 
 
Saginaw, Michigan, Hospital Finance Authority,             
 Revenue Refunding Bonds (Covenant Medical             
 Center), Series E, 5.625%, 7/01/13 (c)        2,500    2,598,600 

 
 
 
Saginaw Valley State University, Michigan, General             
 Revenue Refunding Bonds, 5%, 7/01/24 (d)        2,100    2,110,920 

 
 
 
Saint Clair County, Michigan, Economic Revenue             
 Refunding Bonds (Detroit Edison Co. Project),             
 Series AA, 6.40%, 8/01/24 (h)        17,800    18,265,826 

 
 
 
South Haven, Michigan, Public Schools, GO,             
 5%, 5/01/22 (a)(b)        1,350    1,469,975 

 
 
 
Southfield, Michigan, Library Building Authority, GO,             
 5.50%, 5/01/10 (b)(c)        1,300    1,378,078 

 
 
 
Southfield, Michigan, Public Schools, School Building         
 and Site, GO, Series A (a)(b):             
     5%, 5/01/14        3,500    3,838,975 
     5.25%, 5/01/14        2,900    3,220,160 

 
 
 
Sparta, Michigan, Area Schools, School Building and         
 Site, GO, 5%, 5/01/14 (b)(d)        1,325    1,453,326 

 
 
 
Thornapple Kellogg School District, Michigan, GO,             
 Refunding, 5%, 5/01/32 (c)        2,500    2,563,775 

 
 
 
Waverly, Michigan, Community School, GO,             
 5.50%, 5/01/10 (b)(d)        1,100    1,162,524 

 
 
 
Wayne Charter County, Michigan, Airport Revenue             
 Bonds (Detroit Metropolitan Wayne County), AMT,             
 Series A, 5.375%, 12/01/15 (c)        10,660    10,805,509 

 
 
 
Wayne Charter County, Michigan, Detroit Metropolitan         
 Airport, GO, Airport Hotel, Series A, 5%, 12/01/30 (c)    1,750    1,762,040 

 
 
Wayne County, Michigan, Airport Authority Revenue             
 Bonds (Detroit Metropolitan Wayne County Airport),         
 AMT (c):             
     5.25%, 12/01/25        7,525    7,481,957 
     5.25%, 12/01/26        6,300    6,262,767 
     5%, 12/01/34        9,160    8,523,655 

 
 
 
Wayne County, Michigan, Airport Authority, Revenue             
 Refunding Bonds, AMT (k):             
     5.75%, 12/01/25        4,000    4,170,560 
     5.75%, 12/01/26        1,000    1,038,510 
     5.375%, 12/01/32        8,700    8,623,353 

 
 
 
West Bloomfield, Michigan, School District, GO,             
 Refunding (d):             
     5.50%, 5/01/17        1,710    1,830,110 
     5.50%, 5/01/18        1,225    1,299,321 

 
 
 
West Branch-Rose City, Michigan, Area School             
 District, GO, 5.50%, 5/01/09 (b)(d)        2,405    2,485,231 

 
 
 
Zeeland, Michigan, Public Schools, School Building             
 and Site, GO, 5%, 5/01/29 (c)        1,600    1,632,400 

 
 
 

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Puerto Rico — 4.5%         

 
 
 
Puerto Rico Commonwealth Highway and         
 Transportation Authority, Transportation Revenue         
 Refunding Bonds, Series N, 5.25%, 7/01/39 (d)    $ 5,200    $ 5,156,216 

 
 
Puerto Rico Electric Power Authority, Power Revenue         
 Bonds, Trust Receipts, Class R, Series 16 HH,         
 8.731%, 7/01/13 (a)(f)    3    2,854 

 
 
Puerto Rico Municipal Finance Agency Revenue         
 Bonds, Series A, 5%, 8/01/27 (a)    2,790    2,824,931 

 
 
Puerto Rico Sales Tax Financing Corporation, Sales         
 Tax Revenue Refunding Bonds, Series A (c)(j):         
     5.20%, 8/01/43    12,500    1,735,500 
     4.99%, 8/01/46    20,000    2,333,400 

 
 
Total Municipal Bonds (Cost — $385,330,982) — 148.2%    396,151,403 

 
 
 
 
Municipal Bonds Transferred to         
Tender Option Bond Trusts (l)         

 
 
 
     Michigan — 18.4%         

 
 
 
Detroit, Michigan, Water Supply System, Senior Lien         
 Revenue Bonds, Series A, 5.75%, 7/01/11 (b)(d)    6,700    7,356,533 

 
 
Lakewood, Michigan Public Schools, GO,         
 5.00%, 5/01/37 (a)    6,775    6,620,686 

 
 
Michigan State Building Authority, Revenue Refunding         
 Bonds (Facilities Program), Series I (a):         
     5.50%, 10/15/10    4,750    5,126,010 
     5.50%, 10/15/11    15,030    16,219,775 

 
 
Saginaw Valley State University, Michigan Revenue         
 Bonds, 5.00%, 7/01/31 (a)    7,500    7,673,700 

 
 
Wayne State University, Michigan, University Revenue         
 Refunding Bonds, 5.0%, 11/15/35 (a)    6,000    6,163,260 
       
        49,159,964 

 
 
 
     Puerto Rico — 1.0%         

 
 
 
Puerto Rico Electric Power Authority, Power Revenue         
 Bonds, Series HH, 5.75%, 7/01/10 (a)    2,535    2,714,554 

 
 
Total Municipal Bonds Transferred to Tender Option         
Bond Trusts (Cost — $50,612,859) — 19.4%        51,874,518 

 
 
 
 
 
Short-Term Securities    Shares     

 
 
CMA Michigan Municipal Money Fund, 2.15% (m)(n)    2,724,014    2,724,014 

 
 
Total Short-Term Securities (Cost — $2,724,014) — 1.0%    2,724,014 

 
Total Investments (Cost — $438,667,855*) — 168.6%    450,749,935 
Other Assets Less Liabilities — 2.3%        6,243,327 
Liability for Trust Certificates, Including Interest         
   Expense and Fees Payable — (9.2%)        (24,596,678) 
Preferred Stock, at Redemption Value — (61.7%)        (165,052,682) 
       
Net Assets Applicable to Common Stock — 100.0%        $267,343,902 
       

See Notes to Financial Statements.

14 SEMI-ANNUAL REPORT

APRIL 30, 2008


Schedule of Investments (concluded) BlackRock MuniYield Michigan Insured Fund, Inc.

* The cost and unrealized appreciation (depreciation) of investments as of April 30,
2008, as computed for federal income tax purposes, were as follows:

Aggregate cost    $ 414,606,852 
   
Gross unrealized appreciation    $ 17,311,299 
Gross unrealized depreciation    (5,660,716) 
   
Net unrealized appreciation    $ 11,650,583 
   

(a) FSA Insured.
(b) U.S. government securities, held in escrow, are used to pay interest on this
security as well as to retire the bond in full at the date indicated, typically at
a premium to par.
(c) MBIA Insured.
(d) FGIC Insured.
(e) Security is collateralized by municipal or U.S. Treasury obligations.
(f) Variable rate security. Rate shown is as of report date. Maturity shown is the final
maturity date.
(g) ACA Insured.
(h) AMBAC Insured.
(i) Represents a zero coupon bond. Rate shown reflects the effective yield at the
time of purchase.
(j) GNMA Collateralized.
(k) Assured Guaranty Insured.
(l) Securities represent bonds transferred to a tender option bond trust in exchange
for which the Fund acquired residual interest certificates. These securities
serve as a collateral in a financing transaction. See Note 1 of the Notes to
Financial Statements for details of municipal bonds transferred to tender
option bond trusts.
(m) Represents the current yield as of report date.
(n) Investments in companies considered to be an affiliate of the Fund, for purposes
of Section 2(a)(3) of the Investment Company Act of 1940, were as follows:

    Net    Dividend 
Affiliate    Activity    Income 

 
 
 
CMA Michigan Municipal Money Fund    (1,197,542)    $110,209 

 
 

  See Notes to Financial Statements.

SEMI-ANNUAL REPORT

APRIL 30, 2008

15


Schedule of Investments April 30, 2008 (Unaudited) BlackRock MuniYield New Jersey Insured Fund, Inc.

(Percentages shown are based on Net Assets)

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     New Jersey — 142.8%         

 
 
 
Delaware River and Bay Authority Revenue Bonds,         
 5%, 1/01/33 (b)    $ 1,000    $ 1,005,720 

 
 
Delaware River Joint Toll Bridge Commission of New         
 Jersey and Pennsylvania, Bridge Revenue Refunding         
 Bonds, 5%, 7/01/23    1,875    1,909,031 

 
 
Delaware River Port Authority of Pennsylvania and         
 New Jersey Revenue Bonds, 6%, 1/01/18 (a)    5,000    5,221,400 

 
 
Essex County, New Jersey, Improvement Authority,         
 Airport Revenue Refunding Bonds, AMT,         
 4.75%, 11/01/32 (b)    1,000    904,700 

 
 
Garden State Preservation Trust of New Jersey,         
 Capital Appreciation Revenue Bonds, Series B,         
 5.12%, 11/01/23 (a)(c)    6,925    3,289,444 

 
 
Garden State Preservation Trust of New Jersey, Open         
 Space and Farmland Preservation Revenue Bonds,         
 Series A (a):         
     5.80%, 11/01/22    2,605    2,909,707 
     5.75%, 11/01/28    3,300    3,726,591 

 
 
Gloucester County, New Jersey, Improvement Authority,         
 Solid Waste Resource Recovery, Revenue Refunding         
 Bonds (Waste Management Inc. Project), Series A,         
 6.85%, 12/01/29    2,000    2,083,120 

 
 
Hopatcong, New Jersey, GO, Sewer Refunding Bonds,         
 4.50%, 8/01/33 (d)    750    738,818 

 
 
Hudson County, New Jersey, COP, Refunding,         
 6.25%, 12/01/16 (b)    1,000    1,172,740 

 
 
Hudson County, New Jersey, Improvement Authority,         
 Capital Appreciation Revenue Bonds, Series A-1,         
 4.46%, 12/15/32 (b)(c)    1,000    270,280 

 
 
Hudson County, New Jersey, Improvement Authority,         
 Facility Lease Revenue Refunding Bonds (Hudson         
 County Lease Project), 5.375%, 10/01/24 (e)    7,500    7,564,725 

 
 
Jackson Township, New Jersey, School District, GO,         
 5%, 4/15/12 (e)(f)    5,200    5,604,300 

 
 
Jersey City, New Jersey, Sewer Authority, Sewer         
 Revenue Refunding Bonds, 6.25%, 1/01/14 (d)    3,750    4,113,150 

 
 
Middlesex County, New Jersey, COP, Refunding,         
 5%, 8/01/22 (b)    3,000    3,084,930 

 
 
Monmouth County, New Jersey, Improvement Authority,         
 Governmental Loan Revenue Refunding Bonds (d):         
     5%, 12/01/11 (f)    2,070    2,228,707 
     5%, 12/01/11 (f)(g)    975    1,049,753 
     5.20%, 12/01/14    240    251,390 
     5.25%, 12/01/15    765    802,554 
     5%, 12/01/17    605    634,566 
     5%, 12/01/18    545    564,309 
     5%, 12/01/19    560    579,841 

 
 
Morristown, New Jersey, Parking Authority Revenue         
 Bonds, 4.50%, 8/01/37 (b)    1,355    1,283,226 

 
 

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     New Jersey (continued)         

 
 
 
New Jersey EDA, Cigarette Tax Revenue Bonds:         
     5.625%, 6/15/19    $ 1,060    $ 1,059,491 
     5.75%, 6/15/29    785    767,118 
     5.50%, 6/15/31    225    211,545 
     5.75%, 6/15/34    465    445,000 

 
 
New Jersey EDA, First Mortgage Revenue         
 Bonds (Fellowship Village Project), Series C,         
 5.50%, 1/01/28    1,000    958,200 

 
 
New Jersey EDA, First Mortgage Revenue         
 Refunding Bonds (Fellowship Village), Series A,         
 5.50%, 1/01/18    1,700    1,703,876 

 
 
New Jersey EDA, Motor Vehicle Surcharge Revenue         
 Bonds, Series A (b):         
     4.95%, 7/01/21 (c)    2,325    1,219,556 
     5%, 7/01/29    3,900    3,936,816 
     5.25%, 7/01/33    8,500    8,719,810 
     5%, 7/01/34    1,765    1,776,984 

 
 
New Jersey EDA, School Facilities Construction         
 Revenue Bonds, Series U, 5%, 9/01/37 (d)    1,000    1,019,370 

 
 
New Jersey EDA, School Facilities Construction,         
 Revenue Refunding Bonds, Series K,         
 5.25%, 12/15/17 (e)    1,500    1,620,885 

 
 
New Jersey EDA, Water Facilities Revenue Bonds         
 (New Jersey-American Water Company, Inc.         
 Project), AMT, Series A:         
     5.25%, 11/01/32 (d)    1,000    969,190 
     6.875%, 11/01/34 (e)    5,070    5,127,747 

 
 
New Jersey EDA, Water Facilities Revenue Refunding         
 Bonds (United Water of New Jersey, Inc.),         
 Series B, 4.50%, 11/01/25 (d)    1,000    990,440 

 
 
New Jersey Health Care Facilities Financing Authority         
 Revenue Bonds:         
     (Meridian Health), Series I, 5%, 7/01/38 (h)    750    755,302 
     (Somerset Medical Center), 5.50%, 7/01/33    1,125    934,526 
     (South Jersey Hospital), 6%, 7/01/12 (f)    4,000    4,456,880 

 
 
New Jersey Health Care Facilities Financing Authority,         
 Revenue Refunding Bonds:         
     (Atlantic City Medical Center),         
     5.75%, 7/01/12 (f)    525    579,862 
     (Atlantic City Medical Center),         
     6.25%, 7/01/12 (f)    290    327,152 
     (Atlantic City Medical Center), 6.25%, 7/01/17    325    351,637 
     (Atlantic City Medical Center), 5.75%, 7/01/25    790    810,493 
     (Hackensack University Medical Center),         
     5.25%, 1/01/36 (h)    3,500    3,601,360 
     (Meridian Health System Obligation Group),         
     5.25%, 7/01/19 (a)    2,250    2,316,757 

 
 
New Jersey Sports and Exposition Authority, Luxury         
 Tax Revenue Refunding Bonds (Convention         
 Center) (b):         
     5.50%, 3/01/21    1,540    1,731,776 
     5.50%, 3/01/22    1,000    1,121,880 

 
 

See Notes to Financial Statements.

16 SEMI-ANNUAL REPORT

APRIL 30, 2008


Schedule of Investments (continued) BlackRock MuniYield New Jersey Insured Fund, Inc.

(Percentages shown are based on Net Assets)

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     New Jersey (continued)         

 
 
 
New Jersey State Educational Facilities Authority         
 Revenue Bonds:         
     (Montclair State University), Series A,         
     5%, 7/01/21 (d)    $ 1,600    $ 1,680,320 
     (Rowan University), Series C,         
     5%, 7/01/14 (b)(f)    1,185    1,303,512 
     (Rowan University), Series C,         
     5.125%, 7/01/14 (b)(f)    1,315    1,455,652 

 
 
New Jersey State Educational Facilities Authority,         
 Revenue Refunding Bonds:         
     (College of New Jersey), Series D,         
     5%, 7/01/35 (a)    3,725    3,820,360 
     (Montclair State University), Series J,         
     4.25%, 7/01/30 (b)    2,895    2,650,894 
     (Montclair State University), Series L,         
     5%, 7/01/14 (b)(f)    3,185    3,503,532 
     (Ramapo College), Series I, 4.25%, 7/01/31 (d)    1,250    1,134,900 
     (Ramapo College), Series I, 4.25%, 7/01/36 (d)    3,890    3,472,992 
     (Rowan University), Series B, 5%, 7/01/26 (h)    2,575    2,689,665 
     (Rowan University), Series C, 5%, 7/01/31 (e)    325    323,651 
     (Stevens Institute of Technology), Series A,         
     5%, 7/01/34    1,500    1,330,125 
     (William Paterson University), Series E,         
     5%, 7/01/21 (i)    1,725    1,747,856 

 
 
New Jersey State, GO, Refunding, Series H,         
 5.25%, 7/01/15 (a)    3,500    3,906,385 

 
 
New Jersey State Higher Education Assistance         
 Authority, Student Loan Revenue Bonds, AMT,         
 Series A, 5.30%, 6/01/17 (d)    3,565    3,602,646 

 
 
New Jersey State Housing and Mortgage Finance         
 Agency, Capital Fund Program Revenue Bonds,         
 Series A, 5%, 5/01/27 (a)    1,970    2,031,641 

 
 
New Jersey State Housing and Mortgage Finance         
 Agency, Home Buyer Revenue Bonds, AMT,         
 Series CC, 5.80%, 10/01/20 (b)    2,640    2,709,986 

 
 
New Jersey State Housing and Mortgage Finance         
 Agency, M/F Revenue Bonds, AMT, Series A,         
 4.90%, 11/01/35 (e)    1,000    899,780 

 
 
New Jersey State Housing and Mortgage Finance         
 Agency, S/F Housing Revenue Refunding Bonds,         
 AMT, Series T, 4.70%, 10/01/37    500    440,010 

 
 
New Jersey State Transportation Trust Fund Authority,         
 Transportation System Revenue Bonds:         
     Series A, 5%, 12/15/32 (d)    730    744,549 
     Series C, 4.83%, 12/15/32 (a)(c)    4,750    1,311,855 
     Series C, 5.05%, 12/15/35 (c)(d)    2,760    639,161 
     Series D, 5%, 6/15/19 (a)    3,240    3,439,001 

 
 
New Jersey State Transportation Trust Fund Authority,         
 Transportation System Revenue Refunding Bonds:         
     Series A, 5.25%, 12/15/20 (a)    4,250    4,754,475 
     Series B, 5.50%, 12/15/21 (b)    3,600    4,065,624 

 
 

        Par     
Municipal Bonds        (000)    Value 

 
 
 
 
     New Jersey (concluded)             

 
 
 
 
New Jersey State Turnpike Authority, Turnpike Revenue         
 Bonds:             
     Series B, 5.15%, 1/01/35 (c)(d)    $ 3,005    $ 2,160,565 
     VRDN, Series C-1, 2.10%, 1/01/24 (a)(j)        2,650    2,650,000 

 
 
 
Newark, New Jersey, Housing Authority, Port Authority-         
 Port Newark Marine Terminal, Additional Rent-Backed         
 Revenue Refunding Bonds (City of Newark             
 Redevelopment Projects), 4.375%, 1/01/37 (b)        3,600    3,359,160 

 
 
 
North Hudson Sewage Authority, New Jersey, Sewer             
 Revenue Refunding Bonds, 5.125%, 8/01/20 (b)    1,710    1,867,730 

 
 
Perth Amboy, New Jersey, GO (Convertible CABS),             
 Refunding, 4.75%, 7/01/35 (a)(c)        1,250    1,022,550 

 
 
 
Port Authority of New York and New Jersey, Consolidated         
 Revenue Bonds, 93rd Series, 6.125%, 6/01/94        1,000    1,134,000 

 
 
 
Port Authority of New York and New Jersey,             
 Consolidated Revenue Refunding Bonds, AMT (a):             
     138th Series, 4.75%, 12/01/34        1,000    937,030 
     146th Series, 4.25%, 12/01/32        5,000    4,264,050 

 
 
 
Rahway Valley Sewerage Authority, New Jersey, Sewer         
 Revenue Bonds, CABS, Series A (b)(c):             
     4.74%, 9/01/26        4,100    1,613,268 
     4.36%, 9/01/33        2,350    616,781 

 
 
 
Salem County, New Jersey, Improvement Authority             
 Revenue Bonds (Finlaw State Office Building             
 Project)(a):             
     5.375%, 8/15/28        1,250    1,333,200 
     5.25%, 8/15/38        700    731,346 

 
 
 
Tobacco Settlement Financing Corporation of             
 New Jersey, Asset-Backed Revenue Bonds,             
 7%, 6/01/13 (f)        1,715    2,014,628 

 
 
 
Union County, New Jersey, Utilities Authority, Senior             
 Lease Revenue Refunding Bonds (Ogden Martin             
 System of Union, Inc.), AMT, Series A (d):             
     5.375%, 6/01/17        1,590    1,603,658 
     5.375%, 6/01/18        1,670    1,680,638 

 
 
 
University of Medicine and Dentistry of New Jersey,             
 Revenue Bonds, Series A (d):             
     5.50%, 12/01/18        570    602,547 
     5.50%, 12/01/19        1,145    1,210,380 
     5.50%, 12/01/20        1,130    1,194,523 
     5.50%, 12/01/21        865    914,392 
           
            183,075,673 

 
 
 
 
     Puerto Rico — 9.4%             

 
 
 
 
Puerto Rico Commonwealth Aqueduct and Sewer             
 Authority, Senior Lien Revenue Bonds, Series A,             
 5.125%, 7/01/47 (h)        3,425    3,499,117 

 
 
 

  See Notes to Financial Statements.

SEMI-ANNUAL REPORT

APRIL 30, 2008

17


Schedule of Investments (concluded) BlackRock MuniYield New Jersey Insured Fund, Inc.

(Percentages shown are based on Net Assets)

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Puerto Rico (concluded)         

 
 
 
Puerto Rico Commonwealth Infrastructure Financing         
 Authority, Special Tax and Capital Appreciation         
 Revenue Bonds, Series A (c):         
     4.48%, 7/01/30 (e)    $ 2,750    $ 767,883 
     4.34%, 7/01/37 (d)    2,250    439,448 

 
 
Puerto Rico Electric Power Authority, Power Revenue         
 Bonds, Series RR, 5%, 7/01/28 (k)    2,000    1,930,860 

 
 
Puerto Rico Industrial, Tourist, Educational, Medical         
 and Environmental Control Facilities Revenue Bonds:         
     (Ascension Health), RIB, Series 377,         
     10.26%, 11/15/30 (j)    2,110    2,373,223 
     (University Plaza Project), Series A,         
     5%, 7/01/33 (b)    3,000    3,013,260 
       
        12,023,791 

 
 
Total Municipal Bonds (Cost — $191,758,830) — 152.2%    195,099,464 

 
 
 
 
Municipal Bonds Transferred to         
Tender Option Bond Trusts (l)         

 
 
 
     New Jersey — 3.4%         

 
 
 
New Jersey State Housing and Mortgage Finance         
 Agency, Capital Fund Program Revenue Bonds,         
 Series A, 4.70%, 11/01/25 (a)    4,425    4,377,394 

 
 
Total Municipal Bonds Transferred to Tender Option         
Bond Trusts (Cost — $4,250,882) — 3.4%        4,377,394 

 
 
 
 
 
Short-Term Securities    Shares     

 
 
CMA New Jersey Municipal Money Fund,         
 2.12% (m)(n)    1,992,919    1,992,919 

 
 
Total Short-Term Securities (Cost — $1,992,919) — 1.6%    1,992,919 

 
Total Investments (Cost — $198,002,631*) — 157.2%    201,469,777 
Other Assets Less Liabilities — 1.9%        2,411,171 
Liability for Trust Certificates, Including Interest         
   Expense Payable — (1.7%)        (2,197,942) 
Preferred Stock, at Redemption Value — (57.4%)        (73,529,108) 
       
Net Assets Applicable to Common Stock — 100.0%        $128,153,898 
       

* The cost and unrealized appreciation (depreciation) of investments as of April 30,
2008, as computed for federal income tax purposes, were as follows:

Aggregate cost    $ 195,634,729 
   
Gross unrealized appreciation    $ 6,787,680 
Gross unrealized depreciation    (3,142,632) 
   
Net unrealized appreciation    $ 3,645,048 
   

(a) FSA Insured.
(b) MBIA Insured.
(c) Represents a zero coupon bond. Rate shown reflects the effective yield at the
time of purchase.
(d) AMBAC Insured.
(e) FGIC Insured.
(f) U.S. government securities, held in escrow, are used to pay interest on this
security as well as to retire the bond in full at the date indicated, typically at
a premium to par.
(g) Represents a pay-in-kind security which may pay interest/dividends in additional
face/shares.
(h) Assured Guaranty Insured.
(i) XL Capital Insured.
(j) Variable rate security. Rate shown is as of report date. Maturity shown is the
final maturity date.
(k) CIFG Insured.
(l) Securities represent bonds transferred to a tender option bond trust in exchange
for which the Fund acquired redual interest certificates. These securities serve as
a collateral in a financing transaction. See Note 1 of the Notes to Financial
Statements for details of Municipal bonds transferred to tender option bond
trusts.

(m) Investments in companies considered to be an affiliate of the Fund, for purposes
of Section 2(a)(3) of the Investment Company Act of 1940, were as follows:

    Net    Dividend 
     Affiliate    Activity    Income 

 
 
     CMA New Jersey Municipal Money Fund    1,903,726    $3,848 

 
 
(n) Represents the current yield as of report date.         

  See Notes to Financial Statements.

18 SEMI-ANNUAL REPORT

APRIL 30, 2008


Schedule of Investments April 30, 2008 (Unaudited) BlackRock MuniYield Pennsylvania Insured Fund

(Percentages shown are based on Net Assets)

        Par     
Municipal Bonds        (000)    Value 

 
 
 
 
     Pennsylvania — 136.7%             

 
 
 
 
Allegheny County, Pennsylvania, GO, Series C-60,         
 5%, 11/01/32 (a)    $ 4,650    $ 4,770,249 

 
 
Allegheny County, Pennsylvania, Hospital Development         
 Authority, Health Center Revenue Bonds (University         
 of Pittsburgh Medical Center Health System),         
 Series B, 6%, 7/01/26 (b)        2,000    2,315,200 

 
 
 
Allegheny County, Pennsylvania, Residential Finance         
 Authority, S/F Mortgage Revenue Bonds, AMT,         
 Series TT, 5%, 5/01/35 (c)        955    880,691 

 
 
 
Allegheny County, Pennsylvania, Sanitation Authority,         
 Sewer Revenue Refunding Bonds, Series A,         
 5%, 12/01/30 (b)        5,000    5,050,100 

 
 
 
Chambersburg, Pennsylvania, Area School District,         
 GO (d):             
     5.25%, 3/01/26        2,115    2,186,339 
     5.25%, 3/01/27        2,500    2,578,075 
     5.25%, 3/01/29        4,000    4,112,440 

 
 
 
Connellsville, Pennsylvania, Area School District, GO,         
 Series B, 5%, 11/15/37        1,000    1,013,980 

 
 
 
Delaware County, Pennsylvania, IDA Revenue Bonds         
 (Pennsylvania Suburban Water Company Project),         
 AMT, Series A, 5.15%, 9/01/32 (e)        5,500    5,257,230 

 
 
 
Delaware County, Pennsylvania, IDA, Water Facilities         
 Revenue Refunding Bonds (Aqua Pennsylvania, Inc.         
 Project), AMT, Series B, 5%, 11/01/36 (d)    4,770    4,377,477 

 
 
Delaware Valley Regional Finance Authority,             
 Pennsylvania, Local Government Revenue Bonds,         
 5.75%, 7/01/32        1,500    1,704,750 

 
 
 
East Stroudsburg, Pennsylvania, Area School         
 District, GO:             
     Refunding, 5%, 9/01/25 (a)        7,000    7,307,440 
     Series A, 7.75%, 9/01/27 (d)        2,000    2,416,100 

 
 
 
Erie County, Pennsylvania, Convention Center         
 Authority, Convention Center Hotel Revenue Bonds,         
 5%, 1/15/36 (d)        8,850    8,744,685 

 
 
 
Erie, Pennsylvania, Water Authority, Revenue Refunding         
 Bonds, VRDN, Series A, 2.60%, 12/01/36 (a)(i)    8,000    8,000,000 

 
 
Gettysburg, Pennsylvania, Municipal Authority, College         
 Revenue Refunding Bonds, 5%, 8/15/23 (b)    4,000    4,050,640 

 
 
Harrisburg, Pennsylvania, Authority, School Revenue         
 Refunding Bonds (The School District of Harrisburg         
 Project), VRDN, 2.43%, 12/01/27 (e)(i)        700    700,000 

 
 
 
Monroe County, Pennsylvania, Hospital Authority         
 Revenue Refunding Bonds (Pocono Medical         
 Center), 5.125%, 1/01/37        1,265    1,122,156 

 
 
 
Montgomery County, Pennsylvania, IDA, Water         
 Facilities Revenue Bonds (Aqua Pennsylvania, Inc.         
 Project), Series A, 5.25%, 7/01/42        1,800    1,740,258 

 
 
 
North Allegheny, Pennsylvania, School District, GO,         
 Series C, 5.25%, 5/01/27 (a)        2,675    2,783,792 

 
 
 

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Pennsylvania (continued)         

 
 
 
Northampton Borough, Pennsylvania, Municipal         
 Authority, Water Revenue Bonds, 5%, 5/15/34 (b)    $ 935    $ 950,568 

 
 
Northeastern York School District, Pennsylvania, GO,         
 Series B, 5%, 4/01/32 (d)    1,585    1,582,733 

 
 
Northumberland County, Pennsylvania, IDA,         
 Water Facilities Revenue Refunding Bonds         
 (Aqua Pennsylvania Inc. Project), AMT,         
 5.05%, 10/01/39 (d)    6,000    5,520,120 

 
 
Pennsylvania Economic Development Financing         
 Authority, Solid Waste Disposal Revenue Bonds         
 (Waste Management Inc. Project), AMT, Series A,         
 5.10%, 10/01/27    1,200    1,014,696 

 
 
Pennsylvania HFA, Revenue Bonds, DRIVERS, VRDN,         
 AMT, Series 1248Z, 7.549%, 10/01/09 (i)    2,500    2,511,350 

 
 
Pennsylvania HFA, S/F Mortgage Revenue Refunding         
 Bonds, AMT, Series 96A, 4.70%, 10/01/37    3,000    2,604,930 

 
 
Pennsylvania State Higher Educational Facilities         
 Authority Revenue Bonds:         
     (Drexel University), Series A, 5%, 5/01/37 (b)    5,000    5,037,600 
     (UPMC Health System), Series A, 6%, 1/15/22    3,000    3,194,430 
     (York College of Pennsylvania Project),         
     Series EE1, 5%, 11/01/33 (g)    4,305    4,274,305 

 
 
Pennsylvania State Higher Educational Facilities         
 Authority, State System Revenue Bonds,         
 Series AE, 4.75%, 6/15/32 (b)    8,845    8,819,349 

 
 
Pennsylvania State, IDA, EDR, Refunding,         
 5.50%, 7/01/20 (e)    7,000    7,472,080 

 
 
Pennsylvania State Public School Building Authority,         
 School and Capital Appreciation Revenue Bonds         
 (Corry Area School District) (a)(h):         
     4.85%, 12/15/22    1,980    974,853 
     4.87%, 12/15/23    1,980    919,175 
     4.89%, 12/15/24    1,980    868,329 
     4.92%, 12/15/25    1,980    819,265 

 
 
Pennsylvania State Turnpike Commission, Oil         
 Franchise Tax Revenue Bonds, Series C,         
 5%, 12/01/32    13,600    13,948,024 

 
 
Pennsylvania State Turnpike Commission, Turnpike         
 Revenue Bonds, Series A, 5.50%, 12/01/31    7,800    8,169,954 

 
 
Philadelphia, Pennsylvania, Authority for Industrial         
 Development, Airport Revenue Refunding Bonds         
 (Philadelphia Airport System Project), AMT,         
 Series A (d):         
     5.50%, 7/01/17    4,000    4,059,120 
     5.50%, 7/01/18    3,655    3,693,962 

 
 
Philadelphia, Pennsylvania, Authority for         
 Industrial Development, Lease Revenue Bonds,         
 Series B, 5.50%, 10/01/11 (a)(f)    7,680    8,431,872 

 
 
Philadelphia, Pennsylvania, GO, Refunding, Series A,         
 5.25%, 12/15/32    7,000    7,271,180 

 
 

See Notes to Financial Statements.

SEMI-ANNUAL REPORT

APRIL 30, 2008

19


Schedule of Investments (continued) BlackRock MuniYield Pennsylvania Insured Fund

(Percentages shown are based on Net Assets)

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Pennsylvania (concluded)         

 
 
 
Philadelphia, Pennsylvania, Gas Works Revenue         
 Bonds, 1998 General Ordinance, 4th Series,         
 5%, 8/01/32 (a)    $ 10,000    $ 10,091,200 

 
 
Philadelphia, Pennsylvania, Gas Works         
 Revenue Refunding Bonds, VRDN, Series 6,         
 2.85%, 8/01/31 (a)(i)    1,300    1,300,000 

 
 
Philadelphia, Pennsylvania, Hospitals and Higher         
 Education Facilities Authority, Hospital Revenue         
 Refunding Bonds (Presbyterian Medical Center),         
 6.65%, 12/01/19 (n)    3,000    3,566,610 

 
 
Philadelphia, Pennsylvania, Housing Authority         
 Revenue Bonds (Capital Fund Program), Series A,         
 5.50%, 12/01/18 (a)    3,000    3,221,280 

 
 
Philadelphia, Pennsylvania, Qualified         
 Redevelopment Authority Revenue Bonds, AMT,         
 Series B, 5%, 4/15/27 (d)    4,645    4,410,242 

 
 
Philadelphia, Pennsylvania, Redevelopment Authority         
 Revenue Bonds (Neighborhood Transformation),         
 Series A, 5.50%, 4/15/22 (d)    1,750    1,783,548 

 
 
Philadelphia, Pennsylvania, School District, GO (d)(f):         
     Series B, 5.625%, 8/01/12    10,000    11,065,500 
     Series D, 5.125%, 6/01/14    2,500    2,763,125 

 
 
Philadelphia, Pennsylvania, Water and Wastewater         
 Revenue Bonds, Series A, 5%, 7/01/27 (a)    3,000    3,089,010 

 
 
Pittsburgh, Pennsylvania, Water and Sewer Authority,         
 Water and Sewer System Revenue Refunding Bonds,         
 First Lien, VRDN, Series B-1, 3.10%, 9/01/33 (a)(i)    2,035    2,035,000 

 
 
Reading, Pennsylvania, Area Water Authority, Water         
 Revenue Bonds, 5%, 12/01/27 (a)    3,680    3,815,829 

 
 
Reading, Pennsylvania, School District, GO,         
 5%, 1/15/29 (a)    6,000    6,153,840 

 
 
Sayre, Pennsylvania, Health Care Facilities Authority,         
 Revenue Refunding Bonds (Guthrie Healthcare         
 System), Series A, 5.875%, 12/01/31    590    603,381 

 
 
Scranton, Pennsylvania, School District, GO, Series A,         
 5%, 7/15/38 (a)    10,000    10,215,400 

 
 
Shaler Area School District, Pennsylvania, Capital         
 Appreciation, GO, 4.765%, 9/01/30 (g)(h)    6,145    1,770,313 

 
 
Southcentral General Authority, Pennsylvania, Revenue         
 Bonds (York College of Pennsylvania Project),         
 5%, 5/01/37 (g)    2,000    1,972,860 

 
 
York, Pennsylvania, City School District, GO, Series A,         
 5.25%, 6/01/22 (g)    1,040    1,072,084 
       
        232,178,719 

 
 
 
     Guam — 1.5%         

 
 
 
A.B. Won Guam International Airport Authority,         
 General Revenue Refunding Bonds, AMT, Series C,         
 5%, 10/01/23 (b)    2,500    2,439,550 

 
 

    Par     
Municipal Bonds    (000)    Value 

 
 
 
     Puerto Rico — 11.7%         

 
 
 
Puerto Rico Commonwealth, Public Improvement, GO,         
 Series A, 5%, 7/01/14 (f)    $ 6,790    $ 7,469,068 

 
 
Puerto Rico Public Buildings Authority, Government         
 Facilities Revenue Refunding Bonds, Series I (i)(j):         
     5.375%, 7/01/14    5,000    5,455,050 
     5.50%, 7/01/14    2,500    2,744,600 

 
 
Puerto Rico Sales Tax Financing Corporation, Sales         
 Tax Revenue Refunding Bonds, Series A:         
     5.01%, 8/01/43 (b)(h)    7,000    971,880 
     5.25%, 8/01/57    3,250    3,249,708 
       
        19,890,306 

 
 
Total Municipal Bonds         
(Cost — $253,209,015) — 149.9%        254,508,575 

 
 
 
 
 
Municipal Bonds Transferred to         
Tender Option Bond Trusts (k)         

 
 
 
     Pennsylvania — 13.8%         

 
 
 
Pennsylvania State Public School Building Authority,         
 School Lease Revenue Bonds (The School District         
 of Philadelphia Project), 5.25%, 6/1/13 (a)(f)    15,000    16,487,850 

 
 
Philadelphia Pennsylvania Airport Revenue Bonds,         
 5%, 6/15/37 (a)    7,500    7,035,600 

 
 
Total Municipal Bonds Transferred to Tender Option         
Bond Trusts (Cost — $22,732,496) — 13.8%        23,523,450 

 
 
 
 
 
Short-Term Securities    Shares     

 
 
CMA Pennsylvania Municipal Money Fund,         
 1.90% (l)(m)    15,222,273    15,222,273 

 
 
Total Short-Term Securities (Cost — $15,222,273) — 9.0%    15,222,273 

 
Total Investments (Cost — $291,163,784*) — 172.7%    293,254,298 
Liabilities in Excess of Other Assets — (5.9%)        (10,048,281) 
Liability for Trust Certificates, Including Interest         
   Expense Payable — (6.7%)        (11,379,635) 
Preferred Shares, at Redemption Value — (60.1%)        (102,022,895) 
       
Net Assets Applicable to Common Shares — 100.0%        $169,803,487 
       

  See Notes to Financial Statements.

20 SEMI-ANNUAL REPORT

APRIL 30, 2008


Schedule of Investments (concluded) BlackRock MuniYield Pennsylvania Insured Fund

* The cost and unrealized appreciation (depreciation) of investments as of April 30,
2008, as computed for federal income tax purposes, were as follows:

     Aggregate cost    $ 279,980,670 
   
     Gross unrealized appreciation    $ 6,791,679 
     Gross unrealized depreciation    (4,768,051) 
   
     Net unrealized appreciation    $ 2,023,628 
   
(a) FSA Insured.     
(b) MBIA Insured.     
(c) FNMA/GNMA Collateralized.     
(d) FGIC Insured.     
(e) AMBAC Insured.     

(f) U.S. government securities, held in escrow, are used to pay interest on this
security as well as to retire the bond in full at the date indicated, typically at a
premium to par.
(g) XL Capital Insured.
(h) Represents a zero coupon bond. Rate shown reflects the effective yield at the
time of purchase.
(i) Variable rate security. Rate shown is as of report date. Maturity shown is the final
maturity date.
(j) Commonwealth Guaranteed
(k) Securities represent bonds transferred to a tender option bond trust in exchange
for which the Fund acquired residual interest certificates. These securities serve as
a collateral in a financing transaction. See Note 1 of the Notes to Financial State-
ments for details of municipal bonds transferred to tender option bond trusts.
(l) Represents the current yield as of report date.
(m) Investments in companies considered to be an affiliate of the Fund, for purposes
of Section 2(a)(3) of the Investment Company Act of 1940, were as follows:

    Net    Dividend 
Affiliate    Activity    Income 

 
 
 
CMA Pennsylvania Municipal Money Fund    15,136,011    $36,677 

 
 

(n) Security is collateralized by municipal or U.S. Treasury obligations.
Forward interest rate swaps outstanding as of April 30,2008 were as follows:

    Notional    Unrealized 
    Amount    (Depreciation) 

 
 
 
Pay a fixed rate of 3.326% and receive         
a floating rate based on 1-week         
SIFMA Municipal Swap Index Rate         
Broker, JPMorgan Chase         
Expires July 2018    $17,000,000    $ (54,349) 
Pay a fixed rate of 3.896% and receive         
a floating rate based on 1-week         
SIFMA Municipal Swap Index         
Broker, JPMorgan Chase         
Expires May 2028    $90,000,000    (303,381) 

 
 
Total        $(357,730) 
       

See Notes to Financial Statements.

SEMI-ANNUAL REPORT

APRIL 30, 2008

21


Statements of Assets and Liabilities                 
 
    BlackRock    BlackRock    BlackRock    BlackRock 
    MuniYield    MuniYield    MuniYield     MuniYield 
       Florida    Michigan    New Jersey    Pennsylvania 
April 30, 2008 (Unaudited)    Insured Fund    Insured Fund, Inc.    Insured Fund, Inc.    Insured Fund 

 
 
 
 
     Assets                 

 
 
 
 
Investments at value — unaffiliated1    $193,926,376    $448,025,921    $199,476,858    $278,032,025 
Investments at value — affiliated2    8,383,168    2,724,014    1,992,919    15,222,273 
Cash    409,325    91,037    16,791     
Interest receivable    2,178,779    7,478,576    3,005,045    3,744,185 
Investments sold receivable                32,882,638 
Prepaid expenses    1,513    2,234    1,298    1,656 
   
 
 
 
Total assets    204,899,161    458,321,782    204,492,911    329,882,777 

 
 
 
 
     Accrued Liabilities                 

 
 
 
 
Unrealized depreciation on forward interest rate swaps                357,730 
Investments purchased payable    3,030,415            45,491,199 
Income dividends payable — Common Stock shareholders/Common Shareholders    452,172    1,074,172    475,313    642,912 
Interest expense and fees payable    80,944    104,178    7,942    129,635 
Investment advisory fees payable    74,168    168,193    81,813    107,233 
Other affiliates payable    1,633    2,411    1,178    2,400 
Officer payable    168    382    216    2,935 
Bank overdraft                23,496 
Other accrued expenses payable    59,082    83,362    53,443    48,855 
   
 
 
 
Total accrued liabilities    3,698,582    1,432,698    619,905    46,806,395 

 
 
 
 
 
     Other Liabilities                 

 
 
 
 
Trust certificates3    12,231,263    24,492,500    2,190,000    11,250,000 
   
 
 
 
Total Liabilities    15,929,845    25,925,198    2,809,905    58,056,395 

 
 
 
 
 
     Preferred Stock/Shares                 

 
 
 
 
Preferred Stock/Shares, at redemption value, at $25,000 per share liquidation preference4,5    72,021,645    165,052,682    73,529,108    102,022,895 

 
 
 
 
 
     Net Assets Applicable to Common Stock/Shares                 

 
 
 
 
Net assets applicable to Common Stock/Shares    $116,947,671    $267,343,902    $128,153,898    $169,803,487 

 
 
 
 
 
     Net Assets Applicable to Common Stock/Shares Consist of                 

 
 
 
 
Common Stock/Shares, par value $0.10 per share6    $ 845,181    $ 1,820,630    $ 880,210    $ 1,148,057 
Paid-in capital in excess of par    117,576,408    268,787,335    123,256,564    169,933,802 
Undistributed net investment income    208,293    678,403    1,203,320    518,092 
Accumulated net realized loss    (4,411,879)    (16,024,546)    (653,342)    (3,529,248) 
Net unrealized appreciation/depreciation    2,729,668    12,082,080    3,467,146    1,732,784 
   
 
 
 
Net assets applicable to Common Stock Shareholders/Common Shareholders    $116,947,671    $267,343,902    $128,153,898    $169,803,487 
   
 
 
 
Net asset value per share of Common Stock/Shares    $ 13.84    $ 14.68    $ 14.56    $ 14.79 
   
 
 
 
     1 Investments at cost — unaffiliated    $191,196,708    $435,943,841    $196,009,712    $275,941,511 
   
 
 
 
     2 Investments at cost — affiliated    $ 8,383,168    $ 2,724,014    $ 1,992,919    $ 15,222,273 
   
 
 
 
     3 Represents short-term floating rate certificates issued by tender option bond trusts.                 
     4 Preferred Stock/Shares issued and outstanding:                 
             Series A, par value of $0.05 per share    2,400    2,000    2,240    1,600 
   
 
 
 
             Series B, par value of $0.05 per share    480    2,000        1,920 
   
 
 
 
             Series B, par value of $0.10 per share            700     
   
 
 
 
             Series C, par value of $0.05 per share        1,600        560 
   
 
 
 
             Series D, par value of $0.10 per share        1,000         
   
 
 
 
     5 Preferred Stock/Shares authorized    1,000,000    6,600    2,940    1,000,000 
   
 
 
 
     6 Common Stock/Shares issued and outstanding    8,451,814    18,206,301    8,802,099    11,480,567 
   
 
 
 
 
See Notes to Financial Statements.                 
   
 
 
 

22 SEMI-ANNUAL REPORT

APRIL 30, 2008


Statements of Operations                 
 
    BlackRock    BlackRock    BlackRock       BlackRock 
    MuniYield         MuniYield       MuniYield       MuniYield 
    Florida         Michigan    New Jersey    Pennsylvania 
Six Months Ended April 30, 2008 (Unaudited)    Insured Fund    Insured Fund, Inc. Insured Fund, Inc.    Insured Fund 

 
 
 
 
     Investment Income                 

 
 
 
 
 
Interest    $ 4,806,261    $ 10,135,418    $ 4,796,078    $ 6,863,963 
Dividends from affiliates    38,375    110,209    3,848    36,677 
   
 
 
 
Total income    4,844,636    10,245,627    4,799,926    6,900,640 

 
 
 
 
 
     Expenses                 

 
 
 
 
 
Investment advisory    475,485    1,083,483    506,249    686,976 
Commissions for Preferred Stock/Shares    92,941    207,880    93,866    131,135 
Accounting services    43,808    72,995    42,664    43,875 
Professional    30,726    40,332    32,048    31,021 
Transfer agent    16,538    25,637    16,115    23,508 
Printing    6,700    18,054    9,158    12,257 
Trustees/Directors    6,398    13,098    6,972    7,897 
Custodian    6,289    11,907    6,081    9,218 
Registration    4,468    4,355    4,416    4,452 
Miscellaneous    26,828    39,027    28,883    30,510 
   
 
 
 
Total expenses excluding interest expense and fees    710,181    1,516,768    746,452    980,849 
Interest expense and fees1    184,624    404,464    23,285    366,433 
   
 
 
 
Total expenses    894,805    1,921,232    769,737    1,347,282 
Less fees waived by advisor    (9,850)    (29,029)    (1,005)    (10,031) 
   
 
 
 
Total expenses after waiver    884,955    1,892,203    768,732    1,337,251 
   
 
 
 
Net investment income    3,959,681    8,353,424    4,031,194    5,563,389 

 
 
 
 
 
     Realized and Unrealized Gain (Loss)                 

 
 
 
 
 
Net realized gain (loss) from:                 
     Investments    (1,048,045)    (722,560)    (158,052)    752,217 
     Swaps    (191,322)        (10,031)    (2,350,759) 
   
 
 
 
    (1,239,367)    (722,560)    (168,083)    (1,598,542) 
   
 
 
 
Net change in unrealized appreciation/depreciation on:                 
     Investments    (3,322,390)    (4,409,179)    (3,585,021)    (6,421,689) 
     Swaps    66,960            176,133 
   
 
 
 
    (3,255,430)    (4,409,179)    (3,585,021)    (6,245,556) 
   
 
 
 
Total realized and unrealized loss    (4,494,797)    (5,131,739)    (3,753,104)    (7,844,098) 

 
 
 
 
 
     Dividends and Distributions to Preferred Stock Shareholders/Preferred Shareholders From                 

 
 
 
 
 
Net investment income    (1,356,583)    (3,026,247)    (1,283,508)    (1,865,208) 
Net realized gain            (47,170)     
   
 
 
 
Total dividends and distributions to Preferred Stock shareholders/Preferred Shareholders    (1,356,583)    (3,026,247)    (1,330,678)    (1,865,208) 
   
 
 
 
Net Increase (Decrease) in Net Assets to Common Stock Shareholders/Common Shareholders                 
Resulting from Operations    $ (1,891,699)    $ 195,438    $ (1,052,588)    $ (4,145,917) 
   
 
 
 
     1 Related to tender option bond trusts.                 

See Notes to Financial Statements.

SEMI-ANNUAL REPORT

APRIL 30, 2008

23


Statements of Changes in Net Assets                 
 
    BlackRock MuniYield    BlackRock MuniYield 
    Florida Insured Fund             Michigan Insured Fund, Inc. 
   
 
    Six Months Ended        Six Months Ended     
    April 30, 2008    Year Ended    April 30, 2008    Year Ended 
Increase (Decrease) in Net Assets:    (Unaudited)    October 31, 2007    (Unaudited)    October 31, 2007 

 
 
 
 
     Operations                 

 
 
 
 
Net investment income    $ 3,959,681    $ 8,056,928    $ 8,353,424    $ 19,208,577 
Net realized gain (loss)    (1,239,367)    176,914    (722,560)    1,570,157 
Net change in unrealized appreciation/depreciation    (3,255,430)    (4,348,589)    (4,409,179)    (9,721,365) 
Dividends to Preferred Stock shareholders/Preferred Shareholders from                 
   net investment income    (1,356,583)    (2,631,621)    (3,026,247)    (5,850,606) 
   
 
 
 
Net increase (decrease) in net assets applicable to Common Stock shareholders/                 
   Common Shareholders resulting from operations    (1,891,699)    1,253,632    195,438    5,206,763 

 
 
 
 
 
     Dividends to Common Stock Shareholders/Common Shareholders From                 

 
 
 
 
Net investment income    (2,734,162)    (5,721,878)    (6,445,030)    (12,962,886) 

 
 
 
 
 
     Net Assets Applicable to Common Stock/Shares                 

 
 
 
 
Total decrease in net assets    (4,625,861)    (4,468,246)    (6,249,592)    (7,756,123) 
Beginning of period    121,573,532    126,041,778    273,593,494    281,349,617 
   
 
 
 
End of period    $ 116,947,671    $ 121,573,532    $ 267,343,902    $ 273,593,494 
   
 
 
 
End of period undistributed net investment income    $ 208,293    $ 339,357    $ 678,403    $ 1,796,256 
   
 
 
 

See Notes to Financial Statements.

24 SEMI-ANNUAL REPORT

APRIL 30, 2008


Statements of Changes in Net Assets (concluded)             
 
    BlackRock MuniYield    BlackRock MuniYield 
           New Jersey Insured Fund, Inc.             Pennsylvania Insured Fund 
   
 
    Six Months Ended        Six Months Ended     
    April 30, 2008       Year Ended    April 30, 2008    Year Ended 
Increase (Decrease) in Net Assets:    (Unaudited)    October 31, 2007    (Unaudited)    October 31, 2007 

 
 
 
 
 
     Operations                 

 
 
 
 
 
Net investment income    $ 4,031,194    $ 8,403,981    $ 5,563,389    $ 11,615,514 
Net realized gain (loss)    (168,083)    588,462    (1,598,542)    2,337,245 
Net change in unrealized appreciation/depreciation    (3,585,021)    (4,321,927)    (6,245,556)    (6,999,004) 
Dividends and distributions to Preferred Stock shareholders/Preferred                 
   Shareholders from:                 
   Net investment income    (1,283,508)    (2,420,847)    (1,865,208)    (3,638,710) 
   Net realized gain    (47,170)    (23,780)         
   
 
 
 
Net increase (decrease) in net assets applicable to Common Stock shareholders/                 
   Common Shareholders resulting from operations    (1,052,588)    2,225,889    (4,145,917)    3,315,045 

 
 
 
 
 
     Dividends and Distributions to Common Stock Shareholders/Common Shareholders From:             

 
 
 
 
Net investment income    (2,851,880)    (5,747,771)    (3,857,470)    (7,910,111) 
Net realized gain    (115,598)    (70,742)         
   
 
 
 
Decrease in net assets resulting from dividends and distributions to                 
Common Stock shareholders/Common Shareholders    (2,967,478)    (5,818,513)    (3,857,470)    (7,910,111) 

 
 
 
 
 
     Net Assets Applicable to Common Stock/Shares                 

 
 
 
 
 
Total decrease in net assets    (4,020,066)    (3,592,624)    (8,003,387)    (4,595,066) 
Beginning of period    132,173,964    135,766,588    177,806,874    182,401,940 
   
 
 
 
End of period    $ 128,153,898    $ 132,173,964    $ 169,803,487    $ 177,806,874 
   
 
 
 
End of period undistributed net investment income    $ 1,203,320    $ 1,307,514    $ 518,092    $ 677,381 
   
 
 
 

See Notes to Financial Statements.

SEMI-ANNUAL REPORT

APRIL 30, 2008

25


Financial Highlights                BlackRock MuniYield Florida Insured Fund 
 
    Six Months Ended                         
    April 30, 2008        Year Ended October 31,         
    (Unaudited)       2007       2006             2005        2004         2003 
     Per Share Operating Performance                             

 
 
 
 
 
 
 
Net asset value, beginning of period    $ 14.38    $ 14.91    $ 14.72    $ 15.22    $ 15.04    $ 15.04 
Net investment income1    0.47    0.95    0.97    0.98        0.98    1.05 
Net realized and unrealized gain (loss)    (0.53)    (0.49)    0.24    (0.38)        0.20    (0.06) 
Dividends to Preferred shareholders from net investment income    (0.16)    (0.31)    (0.27)    (0.17)        (0.07)    (0.07) 
   
 
 
 
 
 
 
Net increase (decrease) from investment operations    (0.22)    0.15    0.94    0.43        1.11    0.92 
   
 
 
 
 
 
 
Dividends to Common shareholders from net investment income    (0.32)    (0.68)    (0.75)    (0.90)        (0.93)    (0.92) 
   
 
 
 
 
 
 
Capital charges with respect to the issuance of Preferred Shares                (0.03)             
   
 
 
 
 
 
 
Net asset value, end of period    $ 13.84    $ 14.38    $ 14.91    $ 14.72    $ 15.22    $ 15.04 
   
 
 
 
 
 
Market price, end of period    $ 12.32    $ 12.74    $ 14.21    $ 14.18    $ 14.98    $ 14.18 

 
 
 
 
 
 
 
     Total Investment Return2                             

 
 
 
 
 
 
 
Based on net asset value    (1.26%)3    1.39%    6.87%    2.72%        7.98%    6.45% 
   
 
 
 
 
 
 
Based on market price    (0.79%)3    (5.75%)    5.73%    0.54%        12.73%    5.56% 

 
 
 
 
 
 
 
 
     Ratios to Average Net Assets Applicable to Common Shares                             

 
 
 
 
 
 
 
Total expenses, after waiver and excluding interest expense and fees4,5    1.18%6    1.20%    1.17%    1.20%        1.09%    1.08% 
   
 
 
 
 
 
 
Total expenses, after waiver4    1.49%6    1.52%    1.45%    1.38%        1.27%    1.25% 
   
 
 
 
 
 
 
Total expenses4    1.50%6    1.54%    1.46%    1.38%        1.28%    1.25% 
   
 
 
 
 
 
 
Net investment income4    6.66%6    6.53%    6.58%    6.50%        6.54%    6.86% 
   
 
 
 
 
 
 
Dividends to Preferred Shareholders    2.28%6    2.13%    1.87%    1.13%        0.48%    0.47% 
   
 
 
 
 
 
 
Net investment income to Common Shareholders    4.38%6    4.40%    4.71%    5.37%        6.06%    6.39% 

 
 
 
 
 
 
 
 
     Supplemental Data                             

 
 
 
 
 
 
 
Net assets applicable to Common Shares,                             
end of period (000)    $ 116,948    $121,574    $126,042    $124,422    $ 128,455    $ 126,915 
   
 
 
 
 
 
Preferred Shares outstanding at liquidation preference,                             
end of period (000)    $ 72,000    $ 72,000    $ 72,000    $ 72,000    $ 60,000    $ 60,000 
   
 
 
 
 
 
Portfolio turnover    11%    26%    34%    52%        28%    40% 
   
 
 
 
 
 
 
Asset coverage, end of period (000)    $ 2,624    $ 2,689    $ 2,751    $ 2,728    $ 3,141    $ 3,115 
   
 
 
 
 
 

  1 Based on average shares outstanding.
2 Total investment returns based on market value, which can be significantly greater or lesser than the net asset value, may result in substantially different returns.
Total investment returns exclude the effects of sales charges.
3 Aggregate total investment return.
4 Do not reflect the effect of dividends to Preferred Shareholders.
5 Interest expense and fees related to tender option bond trusts. See Note 1 of the Notes to Financial Statements for details of municipal bonds transferred to
tender option bond trusts.
6 Annualized.

See Notes to Financial Statements.

26 SEMI-ANNUAL REPORT

APRIL 30, 2008


Financial Highlights            BlackRock MuniYield Michigan Insured Fund, Inc. 
 
    Six Months Ended                         
    April 30, 2008        Year Ended October 31,         
    (Unaudited)       2007       2006       2005        2004       2003 
     Per Share Operating Performance                             
Net asset value, beginning of period    $ 15.03    $ 15.45    $ 15.32    $ 15.96    $ 15.94    $ 15.74 
Net investment income1    0.46    1.06    1.04    1.08        1.06    1.10 
Net realized and unrealized gain (loss)    (0.29)    (0.45)    0.22    (0.54)        0.03    0.15 
Dividends to Preferred Stock Holders from net investment income    (0.17)    (0.32)    (0.29)    (0.18)        (0.07)    (0.07) 
   
 
 
 
 
 
 
Net increase (decrease) from investment operations        (0.29)    0.97    0.36        1.02    1.18 
   
 
 
 
 
 
 
Dividends to Common Stock shareholders from net investment                             
   income    (0.35)    (0.71)    (0.84)    (0.98)        (1.00)    (0.98) 
   
 
 
 
 
 
 
Capital charges with respect to the issuance of Preferred Stock                (0.02)             
   
 
 
 
 
 
 
Net asset value, end of period    $ 14.68    $ 15.03    $ 15.45    $ 15.32    $ 15.96    $ 15.94 
   
 
 
 
 
 
Market price, end of period    $ 13.38    $ 13.40    $ 14.67    $ 15.31    $ 15.37    $ 14.69 

 
 
 
 
 
 
 
     Total Investment Return2                             

 
 
 
 
 
 
 
Based on net asset value    0.27%3    2.30%    6.64%    2.24%        7.04%    8.26% 
   
 
 
 
 
 
 
Based on market price    2.50%3    (3.95%)    1.32%    6.10%        11.85%    12.57% 

 
 
 
 
 
 
 
 
     Ratios to Average Net Assets Applicable to Common Stock                             

 
 
 
 
 
 
 
Total expenses, after waiver and excluding interest expense and fees4,5    1.10%6    1.12%    1.11%    1.10%        1.00%    1.01% 
   
 
 
 
 
 
 
Total expenses, after waiver4    1.40%6    1.55%    1.61%    1.42%        1.19%    1.20% 
   
 
 
 
 
 
 
Total expenses4    1.42%6    1.55%    1.62%    1.42%        1.22%    1.21% 
   
 
 
 
 
 
 
Net investment income4    6.19%6    6.95%    6.84%    6.84%        6.69%    6.83% 
   
 
 
 
 
 
 
Dividends to Preferred Stock Holders    2.24%6    2.12%    1.87%    1.13%        0.46%    0.45% 
   
 
 
 
 
 
 
Net investment income to Common Stock Holders    3.95%6    4.83%    4.97%    5.71%        6.23%    6.38% 

 
 
 
 
 
 
 
 
     Supplemental Data                             

 
 
 
 
 
 
 
Net assets applicable to Common Stock, end of period (000)    $ 267,344    $273,593    $281,350    $278,250    $289,695    $289,364 
   
 
 
 
 
 
Preferred Stock outstanding at liquidation preference, end of                             
   period (000)    $ 165,000    $165,000    $165,000    $165,000    $140,000    $140,000 
   
 
 
 
 
 
Portfolio turnover    17%    10%    15%    25%        32%    29% 
   
 
 
 
 
 
 
Asset coverage, end of period (000)    $ 2,620    $ 2,658    $ 2,705    $ 2,686    $ 3,069    $ 3,067 
   
 
 
 
 
 

  1 Based on average shares outstanding.
2 Total investment returns based on market value, which can be significantly greater or lesser than the net asset value, may result in substantially different returns.
Total investment returns exclude the effects of sales charges.
3 Aggregate total investment return.
4 Do not reflect the effect of dividends to Preferred Stock shareholders.
5 Interest expense and fees related to tender option bond trusts. See Note 1 of the Notes to Financial Statements for details of municipal bonds transferred to
tender option bond trusts.
6 Annualized.

See Notes to Financial Statements.

SEMI-ANNUAL REPORT

APRIL 30, 2008

27


Financial Highlights            BlackRock MuniYield New Jersey Insured Fund, Inc. 
 
    Six Months Ended                     
    April 30, 2008        Year Ended October 31,     
    (Unaudited)       2007       2006       2005       2004       2003 
     Per Share Operating Performance                         
Net asset value, beginning of period    $ 15.02    $ 15.42    $ 15.07    $ 15.46    $ 15.25    $ 15.14 
Net investment income1    0.46    0.96    0.97    0.96    1.03    1.06 
Net realized and unrealized gain (loss)    (0.43)    (0.42)    0.36    (0.27)    0.21    0.06 
Dividends and distributions to Preferred Stock shareholders from:                         
   Net investment income    (0.15)    (0.28)    (0.25)    (0.16)    (0.06)    (0.06) 
   Net realized gain    (0.01)    2                2 
   
 
 
 
 
 
Net increase (decrease) from investment operations    (0.13)    0.26    1.08    0.53    1.18    1.06 
   
 
 
 
 
 
Dividends and distributions to Common Stock Holders from:                         
   Net investment income    (0.32)    (0.65)    (0.73)    (0.92)    (0.94)    (0.94) 
   Net realized gain    (0.01)    (0.01)                (0.01) 
   
 
 
 
 
 
Total dividends and distributions to Common Stock shareholders    (0.33)    (0.66)    (0.73)    (0.92)    (0.94)    (0.95) 
   
 
 
 
 
 
Capital charges with respect to the issuance of Preferred Stock                3    (0.03)     
   
 
 
 
 
 
Net asset value, end of period    $ 14.56    $ 15.02    $ 15.42    $ 15.07    $ 15.46    $ 15.25 
   
 
 
 
 
 
Market price, end of period    $ 13.26    $ 13.70    $ 14.96    $ 14.65    $ 15.16    $ 14.39 

 
 
 
 
 
 
 
     Total Investment Return4                         

 
 
 
 
 
 
Based on net asset value    (0.61%)5    2.00%    7.50%    3.49%    7.99%    7.24% 
   
 
 
 
 
 
Based on market price    (0.76%)5    (4.10%)    7.28%    2.60%    12.23%    6.02% 

 
 
 
 
 
 
 
     Ratios to Average Net Assets Applicable to Common Stock                         

 
 
 
 
 
 
Total expense, after waiver and excluding interest expense and fees6,8    1.15%7    1.17%    1.15%    1.16%    1.06%    1.03% 
   
 
 
 
 
 
Total expenses, after waiver6    1.18%7    1.37%    1.59%    1.52%    1.33%    1.29% 
   
 
 
 
 
 
Total expenses6    1.19%7    1.37%    1.59%    1.52%    1.35%    1.30% 
   
 
 
 
 
 
Total net investment income6    6.21%7    6.30%    6.46%    6.21%    6.79%    6.89% 
   
 
 
 
 
 
Dividends to Preferred Stock Holders    1.98%7    1.81%    1.63%    1.03%    0.42%    0.38% 
   
 
 
 
 
 
Net investment income to Common Stock Holders    4.23%7    4.49%    4.83%    5.18%    6.37%    6.51% 

 
 
 
 
 
 
 
     Supplemental Data                         

 
 
 
 
 
 
Net assets applicable to Common Stock, end of period (000)    $ 128,154    $132,174    $135,767    $132,622    $135,370    $133,240 
   
 
 
 
 
 
Preferred Stock outstanding at liquidation preference, end of                         
   period (000)    $ 73,500    $ 73,500    $ 73,500    $ 73,500    $ 73,500    $ 56,000 
   
 
 
 
 
 
Portfolio turnover    9%    23%    11%    29%    16%    21% 
   
 
 
 
 
 
Asset coverage, end of period (000)    $ 2,744    $ 2,798    $ 2,847    $ 2,804    $ 2,842    $ 3,379 
   
 
 
 
 
 

  1 Based on average shares outstanding.
2 Amount is less than ($0.01) per share.
3 Amount is less than $0.01 per share.
4 Total investment returns based on market value, which can be significantly greater or lesser than the net asset value, may result in substantially different returns.
Total investment returns exclude the effects of sales charges.
5 Aggregate total investment return.
6 Do not reflect the effect of dividends to Preferred Stock shareholders.
7 Annualized.
8 Interest expense and fees related to tender option bond trusts. See Note 1 of the Notes to Financial Statements for details of municipal bonds transferred to
tender option bond trusts.

See Notes to Financial Statements.

28 SEMI-ANNUAL REPORT

APRIL 30, 2008


Financial Highlights            BlackRock MuniYield Pennsylvania Insured Fund 
 
    Six Months Ended                     
    April 30, 2008        Year Ended October 31,     
    (Unaudited)       2007       2006       2005       2004       2003 
     Per Share Operating Performance                         
Net asset value, beginning of period    $ 15.49    $ 15.89    $ 15.57    $ 16.04    $ 15.56    $ 15.34 
Net investment income1    0.48    1.01    1.01    1.05    1.08    1.11 
Net realized and unrealized gain (loss)    (0.68)    (0.40)    0.36    (0.35)    0.48    0.16 
Dividends to Preferred Shareholders from net investment income    (0.16)    (0.32)    (0.27)    (0.19)    (0.08)    (0.07) 
   
 
 
 
 
 
Net increase (decrease) from investment operations    (0.36)    0.29    1.10    0.51    1.48    1.20 
   
 
 
 
 
 
Dividends to Common Shareholders from net investment income    (0.34)    (0.69)    (0.78)    (0.96)    (1.00)    (0.98) 
   
 
 
 
 
 
Capital charges with respect to the issuance of Preferred Shares            2    (0.02)         
   
 
 
 
 
 
Net asset value, end of period    $ 14.79    $ 15.49    $ 15.89    $ 15.57    $ 16.04    $ 15.56 
   
 
 
 
 
 
Market price, end of period    $ 13.36    $ 13.67    $ 14.60    $ 14.91    $ 15.61    $ 14.81 

 
 
 
 
 
 
 
     Total Investment Return3                         

 
 
 
 
 
 
Based on net asset value    (2.12%)4    2.19%    7.52%    3.16%    10.15%    8.33% 
   
 
 
 
 
 
Based on market price    0.18%4    (1.85%)    3.16%    1.51%    12.63%    10.07% 

 
 
 
 
 
 
 
     Ratios to Average Net Assets Applicable to Common Shares                         

 
 
 
 
 
 
Total expenses, after waiver and excluding interest expense and fees5,7    1.12%6    1.13%    1.13%    1.13%    1.05%    1.07% 
   
 
 
 
 
 
Total expenses, after waiver5    1.54%6    1.72%    1.69%    1.69%    1.32%    1.29% 
   
 
 
 
 
 
Total expenses5    1.55%6    1.72%    1.70%    1.70%    1.33%    1.30% 
   
 
 
 
 
 
Total net investment income5    6.40%6    6.44%    6.49%    6.56%    6.89%    7.08% 
   
 
 
 
 
 
Dividends to Preferred Shareholders    2.15%6    2.02%    1.76%    1.17%    0.51%    0.47% 
   
 
 
 
 
 
Net investment income to Common Shareholders    4.25%6    4.42%    4.73%    5.39%    6.38%    6.61% 

 
 
 
 
 
 
 
     Supplemental Data                         

 
 
 
 
 
 
Net assets applicable to Common Shares, end of period (000)    $ 169,803    $177,807    $182,402    $178,771    $183,877    $178,337 
   
 
 
 
 
 
Preferred Shares outstanding at liquidation preference, end of                         
period (000)    $ 102,000    $102,000    $102,000    $102,000    $ 88,000    $ 88,000 
   
 
 
 
 
 
Portfolio turnover    17%    35%    25%    42%    41%    41% 
   
 
 
 
 
 
Asset coverage, end of period (000)    $ 2,665    $ 2,743    $ 2,788    $ 2,753    $ 3,090    $ 3,027 
   
 
 
 
 
 

  1 Based on average shares outstanding.
2 Amount is less than ($0.01) per share.
3 Total investment returns based on market value, which can be significantly greater or lesser than the net asset value, may result in substantially different returns.
Total investment returns exclude the effects of sales charges.
4 Aggregate total investment return.
5 Do not reflect the effect of dividends to Preferred Shareholders.
6 Annualized.
7 Interest expense and fees related to tender option bond trusts. See Note 1 of the Notes to Financial Statements for details of municipal bonds transferred to
tender option bond trusts.

See Notes to Financial Statements.

SEMI-ANNUAL REPORT

APRIL 30, 2008

29


Notes to Financial Statements (Unaudited)

1. Significant Accounting Policies:

BlackRock MuniYield Florida Insured Fund, BlackRock MuniYield
Michigan Insured Fund, Inc., BlackRock MuniYield New Jersey Insured
Fund Inc. and BlackRock MuniYield Pennsylvania Insured Fund (the
“Funds” or individually, as the “Fund”) are registered under the Investment
Company Act of 1940, as amended (the “1940 Act”), as non-diversified,
closed-end management investment companies. The Funds’ financial
statements are prepared in conformity with accounting principles gener-
ally accepted in the United States of America, which may require the
use of management accruals and estimates. Actual results may differ
from these estimates. The Funds determine, and make available for
publication, the net asset value of their Common Shares/Stock on a
daily basis. The Fund’s Common Shares/Stock are listed on the New
York Stock Exchange under the symbol MFT for BlackRock MuniYield
Florida Insured Fund, MIY for BlackRock MuniYield Michigan Insured
Fund, Inc., MJI for BlackRock MuniYield New Jersey Insured Fund, Inc.
and MPA for BlackRock MuniYield Pennsylvania Insured Fund.

The following is a summary of significant accounting policies followed by
the Funds:

Valuation of Investments: Municipal investments (including commitments
to purchase such investments on a “when-issued” basis) are valued
on the basis of prices provided by dealers or pricing services selected
under the supervision of each Fund’s Board of Trustees or Directors
(the “Boards”). In determining the value of a particular investment, pric-
ing services may use certain information with respect to transactions
in such investments, quotations from bond dealers, pricing matrixes,
market transactions in comparable investments and various relationships
between investments. Short-term securities are valued at amortized cost.
Swap agreements are valued by quoted fair values received daily by the
Fund’s pricing service.

In the event that application of these methods of valuation results in
a price for an investment which is deemed not to be representative of
the market value of such investment, the investment will be valued by
a method approved by the Boards as reflecting fair value (“Fair Value
Assets”). When determining the price for Fair Value Assets, the invest-
ment advisor and/or sub-advisor seeks to determine the price that the
Fund might reasonably expect to receive from the current sale of that
asset in an arm’s-length transaction. Fair value determinations shall be
based upon all available factors that the investment advisor and/or
sub-advisor deems relevant. The pricing of all Fair Value Assets is sub-
sequently reported to the Boards or a committee thereof.

Derivative Financial Instruments: The Funds may engage in various
portfolio investment strategies to increase the return of the Fund and
to hedge, or protect, its exposure to interest rate movements and move-

ments in the securities markets. Losses may arise if the value of the con-
tract decreases due to an unfavorable change in the price of the
underlying security, or if the counterparty does not perform under
the contract.

Forward interest rate swaps — The Funds may enter into forward
interest rate swaps. In a forward interest rate swap, the Fund and the
counterparty agree to make periodic net payments on a specified
notional contract amount, commencing on a specified future effective
date, unless terminated earlier. When the agreement is closed, the
Fund records a realized gain or loss in an amount equal to the value
of the agreement.

Forward Commitments and When-Issued Delayed Delivery Securities:
Each Fund may purchase securities on a when-issued basis and may
purchase or sell securities on a forward commitment basis. Settlement
of such transactions normally occurs within a month or more after the
purchase or sale commitment is made. Each Fund may purchase securi-
ties under such conditions only with the intention of actually acquiring
them, but may enter into a separate agreement to sell the securities
before the settlement date. Since the value of securities purchased may
fluctuate prior to settlement, the Funds may be required to pay more at
settlement than the security is worth. In addition, the purchaser is not
entitled to any of the interest earned prior to settlement. Upon making
a commitment to purchase a security on a when-issued basis, the Fund
will hold liquid assets worth at least the equivalent of the amount due.

Municipal Bonds Transferred to Tender Option Bond Trusts: The Funds
leverage their assets through the use of tender option bond trusts
(“TOBs”). A TOB is established by a third party sponsor forming a special
purpose entity, into which one or more funds, or an agent on behalf of
the funds, transfers municipal securities. Other funds managed by the
investment advisor may also contribute municipal securities to a TOB
into which the Funds have contributed securities. A TOB typically issues
two classes of beneficial interests: short-term floating rate certificates,
which are sold to third party investors, and residual certificates (“TOB
Residuals”), which are generally issued to the participating funds that
made the transfer or to affiliates of the Fund. The TOB Residuals held by
a Fund include the right of the Fund (1) to cause the holders of a pro-
portional share of the floating rate certificates to tender their certificates
at par, and (2) to transfer, within seven days, a corresponding share of
the municipal securities from the TOB to the Fund. The cash received
by the TOB from the sale of the short-term floating rate certificates,
less transaction expenses, is paid to the Fund, which typically invests
the cash in additional municipal securities. Each Fund’s transfer of the
municipal securities to a TOB is accounted for as a secured borrowing,
therefore the municipal securities deposited into a TOB are presented in
the Fund’s Schedule of Investments and the proceeds from the trans-
action are reported as a liability of the Fund.

30 SEMI-ANNUAL REPORT

APRIL 30, 2008


Notes to Financial Statements (continued)

Interest income from the underlying securities is recorded by the Funds
on an accrual basis. Interest expense incurred on the secured borrowing
and other expenses related to remarketing, administration and trustee
services to a TOB are reported as expenses of the Funds. The floating
rate certificates have interest rates that generally reset weekly and their
holders have the option to tender certificates to the TOB for redemption
at par at each reset date. Similarly, proceeds from residual certificates
issued to affiliates, if any, from the transaction are included in liability for
trust certificates.

As of April 30, 2008, the aggregate value of the underlying municipal
securities transferred to TOBs, the related liability for trust certificates
and the range of interest rates on trust certificates during the period
were as follows:

    Underlying         
    Municipal         
    Securities    Liability for    Range of 
    Transferred    Trust    Interest 
    to TOBs    Certificates    Rates 

 
 
 
BlackRock MuniYield             
   Florida Insured            2.61% – 
   Fund    $25,529,964    $12,231,263    2.907% 

 
 
 
Blackrock MuniYield             
   Michigan Insured            2.166% – 
   Fund, Inc    $51,874,518    $24,492,500    2.842% 

 
 
 
BlackRock MuniYield             
   New Jersey Insured             
   Fund, Inc    $ 4,377,394    $ 2,190,000    2.415% 

 
 
 
BlackRock MuniYield             
   Pennsylvania            2.835% – 
   Insured Fund    $23,523,450    $11,250,000    2.897% 

 
 
 

Financial transactions executed through TOBs generally will underperform
the market for fixed rate municipal bonds in a rising interest rate envi-
ronment, but tend to outperform the market for fixed rate bonds when
interest rates decline or remain relatively stable. Should short-term
interest rates rise, the Funds’ net investment in TOBs likely will adversely
affect the Funds’ investment income and dividends to common share/
stock shareholders. Fluctuations in the market value of municipal securi-
ties deposited into the TOB may adversely affect the Funds’ net asset
values per share.

Segregation: In cases in which the 1940 Act and the interpretive posi-
tions of the Securities and Exchange Commission (“SEC”) require that
each Fund segregate assets in connection with certain investments
(e.g., when-issued securities or swaps), each Fund will, consistent with
certain interpretive letters issued by the SEC, designate on its books
and records cash or other liquid debt securities having a market value
at least equal to the amount that would otherwise be required to be
physically segregated.

Zero-Coupon Bonds: The Funds may invest in zero-coupon bonds, which
are normally issued at a significant discount from face value and do not
provide for periodic interest payments. Zero-coupon bonds may experi-
ence greater volatility in market value than similar maturity debt obliga-
tions which provide for regular interest payments.

Investment Transactions and Investment Income: Investment transactions
are recorded on the dates the transactions are entered into (the trade
dates). Realized gains and losses on security transactions are deter-
mined on the identified cost basis. Dividend income is recorded on the
ex-dividend dates. Interest income is recognized on the accrual method.
The Funds amortize all premiums and discounts on debt securities.

Dividends and Distributions: Dividends from net investment income
are declared daily and paid monthly. Distributions of capital gains
are recorded on the ex-dividend dates. Dividends and distributions to
holders of Preferred Stock Holders are accrued and determined as
described in Note 4.

Income Taxes: It is each Fund’s policy to comply with the requirements
of the Internal Revenue Code applicable to regulated investment com-
panies and to distribute substantially all of its taxable income to its
shareholders. Therefore, no federal income tax provision is required.

Effective April 30, 2008, the Funds implemented Financial Accounting
Standards Board (“FASB”) Interpretation No. 48, “Accounting for
Uncertainty in Income Taxes — an interpretation of FASB Statement
No. 109” (“FIN 48”). FIN 48 prescribes the minimum recognition thresh-
old a tax position must meet in connection with accounting for uncer-
tainties in income tax positions taken or expected to be taken by an
entity, including investment companies, before being measured and
recognized in the financial statements. The investment advisor has evalu-
ated the application of FIN 48 to the Funds, and has determined that
the adoption of FIN 48 does not have a material impact on the Funds’
financial statements. The Funds file U.S. federal and various state and
local tax returns. No income tax returns are currently under examination.
The statute of limitations on the Funds’ U.S. federal tax returns remain
open for the years ended October 31, 2004 through October 31, 2006.
The statutes of limitations on the Funds’ state and local tax returns may
remain open for an additional year depending upon the jurisdiction.

Recent Accounting Pronouncements: In September 2006, Statement
of Financial Accounting Standards No. 157, “Fair Value Measurements”
(“FAS 157”), was issued and is effective for fiscal years beginning after

SEMI-ANNUAL REPORT

APRIL 30, 2008

31


Notes to Financial Statements (continued)

November 15, 2007. FAS 157 defines fair value, establishes a frame-
work for measuring fair value and expands disclosures about fair value
measurements. The impact on the Funds’ financial statement disclo-
sures, if any, is currently being assessed.

In addition, in February 2007, Statement of Financial Accounting
Standards No. 159, “The Fair Value Option for Financial Assets and
Financial Liabilities” (“FAS 159”), was issued and is effective for fiscal
years beginning after November 15, 2007. Early adoption is permitted
as of the beginning of a fiscal year that begins on or before November
15, 2007, provided the entity also elects to apply the provisions of FAS
157. FAS 159 permits entities to choose to measure many financial
instruments and certain other items at fair value that are not currently
required to be measured at fair value. FAS 159 also establishes presen-
tation and disclosure requirements designed to facilitate comparisons
between entities that choose different measurement attributes for similar
types of assets and liabilities. The impact on the Funds’ financial state-
ment disclosures, if any, is currently being assessed.

In March 2008, Statement of Financial Accounting Standards No. 161,
“Disclosures about Derivative Instruments and Hedging Activities — an
amendment of FASB Statement No. 133” (“FAS 161”) was issued and
is effective for fiscal years beginning after November 15, 2008. FAS 161
is intended to improve financial reporting for derivative instruments by
requiring enhanced disclosure that enables investors to understand how
and why an entity uses derivatives, how derivatives are accounted for,
and how derivative instruments affect an entity’s results of operations
and financial position. The investment advisor is currently evaluating the
implications of FAS 161 and the impact on the Funds’ financial state-
ment disclosures, if any, is currently being assessed.

Deferred Compensation and BlackRock Closed-End Share Equivalent
Investment Plan: Under the deferred compensation plan approved by
the Funds’ Boards, non-interested Trustees or Directors (“Independent
Trustees or Directors”) may defer a portion of their annual complex-wide
compensation. Deferred amounts earn an approximate return as though
equivalent dollar amounts had been invested in common shares of the
other certain BlackRock Closed-End Funds selected by the Independent
Trustees or Directors. This has approximately the same economic effect
for the Independent Trustees or Directors as if the Independent Trustees
or Directors had invested the deferred amounts directly in the other
certain BlackRock Closed-End Funds.

The deferred compensation plan is not funded and obligations there-
under represent general unsecured claims against the general assets
of each Fund. Each Fund may, however, elect to invest in common
stock of the other certain BlackRock Closed-End Funds selected by
the Independent Trustees or Directors in order to match its deferred
compensation obligations. Investments to cover the Funds’ deferred
compensation liability, if any, are included in other assets on the
Statements of Assets and Liabilities.

Other: Expenses directly related to one of the Funds is charged to that
Fund. Other operating expenses shared by several funds are pro-rated
among those funds on the basis of relative net assets or other appro-
priate methods.

2. Investment Advisory Agreement and Other Transactions
with Affiliates:

The Funds have entered into an Investment Advisory Agreement with
BlackRock Advisors, LLC (the “Advisor”), an indirect, wholly owned sub-
sidiary of BlackRock, Inc., to provide investment advisory and adminis-
tration services. Merrill Lynch & Co., Inc. (“Merrill Lynch”) and The PNC
Financial Services Group, Inc. are principal owners of BlackRock, Inc.

The Advisor is responsible for the management of each Fund’s portfolio
and provides the necessary personnel, facilities, equipment and
certain other services necessary to the operations of the Funds. For such
services, each Fund pays a monthly fee at an annual rate of 0.50% of
each Fund’s average daily net assets, including proceeds from the
issuance of Preferred Shares/Stock and TOBs.

The Advisor has agreed to waive its advisory fees by the amount of
investment advisory fees each Fund pays to the Advisor indirectly
through its investment in affiliated money market funds. These amounts
are included in fees waived by advisor on the Statements of Operations.
For the six months ended April 30, 2008, the amounts were as follows:

    Waiver for the 
    Six Months Ended 
    April 30, 2008 

 
BlackRock MuniYield Florida Insured Fund    $ 9,850 
BlackRock MuniYield Michigan Insured Fund, Inc    $29,029 
BlackRock MuniYield New Jersey Insured Fund, Inc    $ 1,005 
BlackRock MuniYield Pennsylvania Insured Fund    $10,031 

 

The Advisor has entered into a separate sub-advisory agreement with
BlackRock Investment Management, LLC (“BIM”), an affiliate of the
Advisor, with respect to each Fund, under which the Advisor pays BIM for
services it provides, a monthly fee that is a percentage of the investment
advisory fee paid by each Fund to the Advisor.

For the six months ended April 30, 2008, each of the Funds reimbursed
the Advisor for certain accounting services expenses which are included
in accounting services in the Statements of Operations. The reimburse-
ments were as follows:

    Reimbursement 

 
BlackRock MuniYield Florida Insured Fund    $1,651 
BlackRock MuniYield Michigan Insured Fund, Inc    $3,639 
BlackRock MuniYield New Jersey Insured Fund, Inc    $1,802 
BlackRock MuniYield Pennsylvania Insured Fund    $2,437 

 

Certain officers and/or trustees or directors of each Fund are officers
and/or directors of BlackRock, Inc. or its affiliates.

32 SEMI-ANNUAL REPORT

APRIL 30, 2008


Notes to Financial Statements (continued)

3. Investments:

Purchases and sales of investments, excluding short-term securities, for
the six months ended April 30, 2008, were as follows:

    Total    Total 
    Purchases    Sales 

 
 
BlackRock MuniYield Florida         
   Insured Fund    $22,316,760    $32,258,695 
BlackRock MuniYield Michigan         
   Insured Fund, Inc    $76,029,329    $78,523,396 
BlackRock MuniYield New Jersey         
   Insured Fund, Inc    $19,122,652    $18,252,274 
BlackRock MuniYield Pennsylvania         
   Insured Fund, Inc    $49,555,739    $75,271,107 

 
 
 
4. Capital Share/Stock Transactions:     

BlackRock MuniYield Florida Insured Fund and BlackRock MuniYield
Pennsylvania Insured Fund are authorized to issue an unlimited number
of Common Shares of beneficial interest, par value $0.10 per share
together with 1,000,000 Preferred Shares of beneficial interest, par
value of $0.05 per share. Each Fund's Board is authorized, however, to
classify and reclassify any unissued shares of capital stock without
approval of the holders of Common Shares.

BlackRock MuniYield Michigan Insured Fund, Inc. and BlackRock
MuniYield New Jersey Insured Fund, Inc. are authorized to issue
200,000,000 shares of stock, including Preferred Stock, par value
$0.10 per share or $0.05 per share, all of which were initially classified
as Common Stock. Each Fund's Board is authorized, however, to classify
and reclassify any unissued shares of capital stock without approval of
holders of Common Stock.

Common Shares/Stock

Shares issued and outstanding for each of the Funds during the six
months ended April 30, 2008 and the year ended October 31, 2007
remained constant.

Preferred Shares/Stock

Preferred Shares/Stock of the Funds have a liquidation preference
of $25,000 per share plus accrued and unpaid dividends, that entitles
their holders to receive cash dividends at varying annualized rates for
each dividend period. BlackRock MuniYield Florida Insured Fund and
BlackRock MuniYield Pennsylvania Insured Fund has a par value of
$0.05 per share. BlackRock MuniYield Michigan Insured Fund, Inc. has a
par value of $0.05 per share on Series A Shares, Series B Shares and
Series C Shares, and $0.10 per share on Series D Shares. BlackRock
MuniYield New Jersey Insured Fund, Inc. has a par value of $0.05 per
share for Series A Shares and $0.10 per share for Series B Shares. The
yields in effect at April 30, 2008 were as follows:

        BlackRock 
    BlackRock    MuniYield 
    MuniYield Florida    Michigan Insured 
    Insured Fund    Fund, Inc. 

 
 
Series A    3.594%1    3.797%1 
Series B    4.271%2    3.594%1 
Series C        3.488%1 
Series D        4.368%2 

 
 
 
 
    BlackRock    BlackRock 
    MuniYield    MuniYield 
    New Jersey Insured    Pennsylvania 
    Fund, Inc.    Insured Fund 

 
 
Series A    3.594%1    3.594%1 
Series B    4.368%2    3.777%1 
Series C        4.368%2 

 
 

1 The maximum applicable rate on this series of Preferred Shares/Stock is the
higher of 110% of the AA commercial paper rate or 110% of 90% of the Kenny
S&P 30-day High Grade Index rate divided by 1.00 minus the marginal tax rate.

2 The maximum applicable rate on this series of Preferred Shares/Stock is the
higher of 110% of the Telerate/BBA LIBOR or 110% of 90% of the Kenny S&P
30-day High Grade Index rate divided by 1.00 minus the marginal tax rate.

Shares of Preferred Stock/Shares issued and outstanding for each of
the Funds during the six months ended April 30, 2008 and the year
ended October 31, 2007 remained constant.

Each Fund pays commissions to certain broker-dealers at the end of each
auction at an annual rate of 0.25%, calculated on the aggregate principal
amount. For the six months ended April 30, 2008, Merrill Lynch, Pierce,
Fenner & Smith Incorporated, a wholly owned subsidiary of Merrill Lynch,
earned commissions as follows:

    Commissions 

 
BlackRock MuniYield Florida Insured Fund    $ 60,031 
BlackRock MuniYield Michigan Insured Fund, Inc    $101,710 
BlackRock MuniYield New Jersey Insured Fund, Inc    $ 55,559 
BlackRock MuniYield Pennsylvania Insured Fund    $ 76,827 

 

Dividends on seven-day Preferred Shares/Stock are cumulative at a
rate which is reset every seven days based on the results of an auction.
If the Preferred Shares/Stock fails to clear the auction on an auction
date, each Fund is required to pay the maximum applicable rate on the
Preferred Shares/Stock to holders of such shares for each successive
dividend period until such time as the stock is successfully auctioned.
The maximum applicable rate on the Preferred Shares/Stock is footnoted
as applicable on the above chart. During the six months ended April 30,
2008, the Preferred Shares/Stock of each Fund was successfully auc-
tioned at each auction date until February 13, 2008. The low, high and
average dividend rates on the Preferred Shares/Stock for each Fund
for the six months ended April 30, 2008 were as follows:

SEMI-ANNUAL REPORT

APRIL 30, 2008

33


Notes to Financial Statements (continued)

BlackRock MuniYield Florida Insured Fund         

 
 
    Low    High    Average 

 
 
 
Series A    2.756%    4.750%    3.720% 
Series B    3.200%    5.060%    4.003% 

 
 
 
 
BlackRock MuniYield Michigan Insured Fund, Inc.         

 
 
    Low    High    Average 

 
 
 
Series A    2.833%    4.600%    3.684% 
Series B    2.778%    4.508%    3.583% 
Series C    3.000%    4.500%    3.653% 
Series D    3.000%    5.198%    3.956% 

 
 
 
 
BlackRock MuniYield New Jersey Insured Fund, Inc.         

 
 
    Low    High    Average 

 
 
 
Series A    2.778%    4.508%    3.499% 
Series B    2.700%    5.198%    3.831% 

 
 
 
 
BlackRock MuniYield Pennsylvania Insured Fund         

 
 
    Low    High    Average 

 
 
 
Series A    2.756%    4.508%    3.586% 
Series B    2.681%    4.400%    3.606% 
Series C    2.900%    5.198%    3.988% 

 
 
 

Since February 13, 2008, the Preferred Stock/Shares of each Fund
failed to clear any auctions. As a result, the Preferred Stock/Shares divi-
dend rates were reset to the maximum applicable rate, which ranged
from 2.756% to 5.198% . A failed auction is not an event of default
for the Fund but it is a liquidity event for the holders of the Preferred
Shares/Stock. A failed auction occurs when there are more sellers of
a fund’s auction rate preferred stock than buyers. It is impossible to
predict how long this imbalance will last. An auction for each Fund’s
Preferred Shares/Stock may not occur for some time, if ever, and even
if liquidity does resume, holders of Preferred Shares/Stock may not
have the ability to sell the Preferred Shares/Stock at its liquidation
preference.

The Funds may not declare dividends or make other distributions on
Common Shares/Stock or purchase any such shares if, at the time of
the declaration, distribution or purchase, asset coverage with respect to
the outstanding Preferred Shares/Stock would be less than 200%.

The Preferred Shares/Stock is redeemable at the option of each Fund, in
whole or in part, on any dividend payment date at $25,000 per share
plus any accumulated unpaid dividends whether or not declared. The
Preferred Shares/Stock is also subject to mandatory redemption at
$25,000 per share plus any accumulated or unpaid dividends, whether

or not declared, if certain requirements relating to the composition of
the assets and liabilities of the Fund, as set forth in each Fund’s
Certificates of Designation/Articles Supplementary, are not satisfied.

The holders of Preferred Shares/Stock have voting rights equal to the
holders of Common Shares/Stock (one vote per share) and will vote
together with holders of Common Shares/Stock (one vote per share) as
a single class. However, holders of Preferred Shares/Stock, voting as a
separate class, are also entitled to elect two Trustees or Directors for
each Fund. In addition, the 1940 Act requires that along with approval
by shareholders that might otherwise be required, the approval of the
holders of a majority of any outstanding Preferred Shares/Stock, voting
separately as a class would be required to (a) adopt any plan of reor-
ganization that would adversely affect the Preferred Shares/Stock, (b)
change each Fund’s subclassification as a closed-end investment com-
pany or change its fundamental investment restrictions or (c) change its
business so as to cease to be an investment company.

5. Capital Loss Carryforward:

BlackRock MuniYield Florida Insured Fund

As of October 31, 2007, the Fund had a capital loss carryforward of
$2,587,527, of which $505,802 expires in 2008 and $2,081,725
expires in 2012. This amount will be available to offset future realized
capital gains.

BlackRock MuniYield Michigan Insured Fund, Inc.

As of October 31, 2007, the Fund had a capital loss carryforward
of $11,763,462, of which $6,685,590 expires in 2008, $1,124,652
expires in 2010 and $3,953,220 expires in 2012. This amount will
be available to offset future realized capital gains.

BlackRock MuniYield Pennsylvania Insured Fund

As of October 31, 2007, the Fund had a capital loss carryforward of
$1,135,911, all of which expires in 2008. This amount will be available
to offset future realized capital gains.

6. Concentration Risk:

Each Fund’s investments are concetrated in certain states, which may be
affected by adverse financial, social, environmental, economic, regulatory
and political factors.

Many municipalities insure repayment of their bonds, which reduces the
risk of loss due to issuer default. The market value of these bonds may
fluctuate for other reasons and there is no assurance that the insurer
will meet its obligation.

34 SEMI-ANNUAL REPORT

APRIL 30, 2008


Notes to Financial Statements (concluded)

7. Subsequent Events:

BlackRock MuniYield Florida Insured Fund

The Fund paid a tax-exempt income dividend to holders of its Common
Shares in the amount of $0.053500 per share on June 2, 2008 to
shareholders of record on May 15, 2008.

BlackRock MuniYield Michigan Insured Fund, Inc.

The Fund paid a tax-exempt income dividend to holders of its Common
Stock in the amount of $0.05900 per share on June 2, 2008 to
shareholders of record on May 15, 2008.

BlackRock MuniYield New Jersey Insured Fund, Inc.

The Fund paid a tax-exempt income dividend to holders of its Common
Stock in the amount of $0.054000 per share on June 2, 2008
to shareholders of record on May 15, 2008.

BlackRock MuniYield Pennsylvania Insured Fund

The Fund paid a tax-exempt income dividend to holders of its Common
Shares in the amount of $0.056000 per share on June 2, 2008 to
shareholders of record on May 15, 2008.

The dividends declared on Preferred Shares/Stock for the period
May 1, 2008 to May 31, 2008 were as follows:

        BlackRock 
    BlackRock    MuniYield 
    MuniYield Florida    Michigan Insured 
    Insured Fund    Fund, Inc. 

 
 
Series A    $173,703    $140,341 
Series B    $41,982    $143,710 
Series C        $111,340 
Series D        $ 89,911 

 
 
 
 
    BlackRock    BlackRock 
    MuniYield    MuniYield 
    New Jersey Insured    Pennsylvania 
    Fund, Inc.    Insured Fund 

 
 
Series A    $165,558    $ 98,944 
Series B    $ 65,933    $111,725 
Series C        $ 52,746 

 
 

On June 2, 2008, the Funds announced the following redemptions of
Preferred Shares/Stock at a price of $25,000 per share plus any
accrued and unpaid dividends through the redemption date:

        Shares     
BlackRock MuniYield    Redemption    to be    Aggregate 
Florida Insured Fund:    Date    Redeemed    Price 

 
 
 
Series A    6/24/2008    325    $8,125,000 
Series B    6/26/2008    65    $1,625,000 

 
 
 

        Shares     
BlackRock MuniYield    Redemption    to be    Aggregate 
Michigan Insured Fund, Inc.:    Date    Redeemed    Price 

 
 
 
Series A    6/25/2008    247    $6,175,000 
Series B    6/23/2008    247    $6,175,000 
Series C    6/26/2008    197    $4,925,000 
Series D    6/24/2008    123    $3,075,000 

 
 
 
 
 
        Shares     
BlackRock MuniYield    Redemption    to be    Aggregate 
New Jersey Insured Fund, Inc.:    Date    Redeemed    Price 

 
 
 
Series A    6/23/2008    238    $5,950,000 
Series B    6/27/2008    74    $1,850,000 

 
 
 
 
 
        Shares     
BlackRock MuniYield    Redemption    to be    Aggregate 
Pennsylvania Insured Fund:    Date    Redeemed    Price 

 
 
 
Series A    6/24/2008    386    $ 9,650,000 
Series B    6/25/2008    463    $11,575,000 
Series C    6/27/2008    135    $ 3,375,000 

 
 
 

The Funds will finance the Preferred Shares/Stock redemptions with
cash received from TOB transactions.

SEMI-ANNUAL REPORT

APRIL 30, 2008

35


Officers and Trustees or Directors

G. Nicholas Beckwith, III, Trustee or Director
Richard E. Cavanagh, Trustee or Director
Richard S. Davis, Fund President (MFT & MPA), Trustee or Director
Kent Dixon, Trustee or Director
Frank J. Fabozzi, Trustee or Director
Kathleen F. Feldstein, Trustee or Director
James T. Flynn, Trustee or Director
Henry Gabbay, Trustee or Director
Jerrold B. Harris, Trustee or Director
R. Glenn Hubbard, Trustee or Director
W. Carl Kester, Trustee or Director
Karen . Robards, Trustee or Director
Robert S. Salomon, Jr., Trustee or Director
Donald C. Burke, Fund President (MIY & MJI) and
Chief Executive Officer
Anne F. Ackerley, Vice President
Neal J. Andrews, Chief Financial Officer
Jay M. Fife, Treasurer
Brian . Kindelan, Chief Compliance Officer of the Funds
Howard Surloff, Secretary

BlackRock MuniYield Florida Insured Fund
BlackRock MuniYield Michigan Insured Fund, Inc.
BlackRock MuniYield New Jersey Insured Fund, Inc.:

Transfer Agents
Common Shares/Stock and
Preferred Shares/Stock:
BNY Mellon Shareowner Services
Jersey City, NJ 07310

Custodian
The Bank of New York Mellon
New York, NY 10286

BlackRock MuniYield Pennsylvania Insured Fund:

Custodian
State Street Bank and Trust Company
Boston, MA 02101

Transfer Agents
Common Shares:
Computershare Trust
Company, N.A.
Providence, RI 02940

Preferred Shares:
BNY Mellon Shareowner Services
Jersey City, NJ 07310

For All Funds:

Accounting Agent
State Street Bank and Trust Company
Princeton, NJ 08540

Independent Registered Public
Accounting Firm
Deloitte & Touche LLP
Princeton, NJ 08540

Legal Counsel
Skadden, Arps, Slate, Meagher & Flom LLP
New York, NY 10036

We are pleased to announce that, effective March 1, 2008, Fred
Stuebe assumed responsibility for the day-to-day management
of BlackRock MuniYield New Jersey Insured Fund, Inc.’s portfolio.
Mr. Stuebe is a Director of BlackRock, Inc. He joined the firm
following the merger with Merrill Lynch Investment Managers
(MLIM) in 2006. Previously, he was a Director and Portfolio
Manager in the Municipal Tax-Exempt Fund Management group
of MLIM from 1989 to 2006. Prior to joining MLIM, Mr. Stuebe
was a Portfolio Manager in the Municipal Tax-Exempt Investments
group of Old Republic Insurance Company in Chicago from 1984
to 1989.

36 SEMI-ANNUAL REPORT APRIL 30, 2008


  Additional Information

Dividend Policy

The Funds’ dividend policy is to distribute all or a portion of their net invest-
ment income to their shareholders on a monthly basis. In order to provide
shareholders with a more stable level of dividend distributions, the Funds
may at times pay out less than the entire amount of net investment income
earned in any particular month and may at times in any particular month
pay out such accumulated but undistributed income in addition to net

  investment income earned in that month. As a result, the dividends paid
by the Funds for any particular month may be more or less than the
amount of net investment income earned by the Funds during such month.
The Funds’ current accumulated but undistributed net investment income,
if any, is disclosed in the Statements of Assets and Liabilities, which com-
prises part of the financial information included in this report.

  Availability of Quarterly Schedule of Investments

The Funds file their complete schedule of portfolio holdings with the
Securities and Exchange Commission (“SEC”) for the first and third quar-
ters of each fiscal year on Form N-Q. The Funds’ Forms N-Q are available
on the SEC’s website at http://www.sec.gov and may also be reviewed

and copied at the SEC’s Public Reference Room in Washington, DC.
Information on the operation of the Public Reference Room may be
obtained by calling (800) SEC-0330. The Funds’ Forms N-Q may also be
obtained upon request and without charge by calling (800) 441-7762.

Electronic Delivery

Electronic copies of most financial reports are available on the Funds’
websites or shareholders can sign up for e-mail notifications of quarterly
statements, annual and semi-annual reports by enrolling in the Funds’
electronic delivery program.

Shareholders Who Hold Accounts with Investment Advisors,
Banks or Brokerages:

Please contact your financial advisor to enroll. Please note that not all
investment advisors, banks or brokerages may offer this service.

  General Information

The Funds will mail only one copy of shareholder documents, including
annual and semi-annual reports and proxy statements, to shareholders
with multiple accounts at the same address. This practice is commonly
called “householding” and it is intended to reduce expenses and elmi-
nate duplicate mailings of shareholder documents. Mailings of you share-
holder documents may be householded indefinitely unless you instruct us
otherwise. If you do not want the mailing of these documents to be com-
bined with those for other members of your household, please contact
the Funds at (800) 441-7762.

  Quarterly performance, semi-anual and annual reports and other infor-
mation regarding the Funds may be found on BlackRock’s website,
which can be accessed at http://www.blackrock.com. This reference
to BlackRock’s website is intended to allow investors public access to
information regarding the Funds and does not, and is not intended to,
incorporate BlackRock’s website into this report.

Deposit Securities

Effective May 30, 2008, following approval by the Funds’ Board and the
applicable ratings agencies, the definition of “Deposited Securities”
in the Funds’ Certificates of Designation/Articles Supplementary was
amended in order to facilitate the redemption of the Funds’ Preferred
Stock. The following phrase was added to the definition of “Deposit
Securities” found in Funds’ Certificates of Designation/Articles
Supplementary:

; provided, however, that solely in connection with any redemption of
AMPS, the term Deposit Securities shall include (i) any committed
financing pursuant to a credit agreement, reverse repurchase agree-
ment facility or similar credit arrangement, in each case which makes

  available to the Corporation, no later than the day preceding the
applicable redemption date, cash in an amount not less than the
aggregate amount due to Holders by reason of the redemption of
their shares of AMPS on such redemption date; and (ii) cash
amounts due and payable to the Corporation out of a sale of its
securities if such cash amount is not less than the aggregate amount
due to Holders by reason of the redemption of their shares of AMPS
on such redemption date and such sale will be settled not later than
the day preceding the applicable redemption date.

SEMI-ANNUAL REPORT

APRIL 30, 2008

37


Additional Information (concluded)

BlackRock Privacy Principles

BlackRock is committed to maintaining the privacy of its current and
former fund investors and individual clients (collectively, “Clients”) and to
safeguarding their non-public personal information. The following infor-
mation is provided to help you understand what personal information
BlackRock collects, how we protect that information and why in certain
cases we share such information with select parties.

If you are located in a jurisdiction where specific laws, rules or regulations
require BlackRock to provide you with additional or different privacy-
related rights beyond what is set forth below, then BlackRock will comply
with those specific laws, rules or regulations.

BlackRock obtains or verifies personal non-public information from and
about you from different sources, including the following: (i) information
we receive from you or, if applicable, your financial intermediary, on appli-
cations, forms or other documents; (ii) information about your transac-
tions with us, our affiliates, or others; (iii) information we receive from a
consumer reporting agency; and (iv) from visits to our websites.

BlackRock does not sell or disclose to non-affiliated third parties any non-
public personal information about its Clients, except as permitted by law
or as is necessary to respond to regulatory requests or to service Client
accounts. These non-affiliated third parties are required to protect the
confidentiality and security of this information and to use it only for its
intended purpose.

We may share information with our affiliates to service your account or to
provide you with information about other BlackRock products or services
that may be of interest to you. In addition, BlackRock restricts access to
nonpublic personal information about its Clients to those BlackRock
employees with a legitimate business need for the information. BlackRock
maintains physical, electronic and procedural safeguards that are designed
to protect the nonpublic personal information of its Clients, including
procedures relating to the proper storage and disposal of such information.

38 SEMI-ANNUAL REPORT

APRIL 30, 2008



This report is transmitted to shareholders only. It is not a prospec-
tus. Past performance results shown in this report should not be
considered a representation of future performance. The Funds have
leveraged their Common Shares or Stock. Leverage creates risks for
Common Shareholders or Common Stock shareholders, including
the likelihood of greater volatility of net asset value and market
price of the Common Shares or Stock, and the risk that fluctuations
in the short-term dividend rates of the Preferred Shares or Stock,
currently set at the maximum reset rate as a result of failed auc-
tions, may affect the yield to Common Shareholders or Common
Stock shareholders. Statements and other information herein are
as dated and are subject to change.

A description of the policies and procedures that the Funds use
to determine how to vote proxies relating to portfolio securities
is available (1) without charge, upon request, by calling toll-free
(800) 441-7762; (2) at www.blackrock.com; and (3) on the Secu-
rities and Exchange Commission’s website at http://www.sec.gov.
Information about how the Funds voted proxies relating to securities
held in the Funds’ portfolios during the most recent 12-month
period ended June 30 is available upon request and without charge
(1) at www.blackrock.com or by calling (800) 441-7762 and
(2) on the Securities and Exchange Commission’s website at
http://www.sec.gov.

BlackRock MuniYield Florida Insured Fund

BlackRock MuniYield Michigan Insured Fund, Inc.

BlackRock MuniYield New Jersey Insured Fund, Inc.

BlackRock MuniYield Pennsylvania Insured Fund

100 Bellevue Parkway

Wilmington, DE 19809

#MYFLMINJPA-4/08


Item 2 – Code of Ethics – Not Applicable to this semi-annual report

Item 3 – Audit Committee Financial Expert – Not Applicable to this semi-annual report

Item 4 – Principal Accountant Fees and Services – Not Applicable to this semi-annual report

Item 5 – Audit Committee of Listed Registrants – Not Applicable to this semi-annual report

Item 6 – Investments
(a) The registrant’s Schedule of Investments is included as part of the Report to
Stockholders filed under Item 1 of this form.
(b) Not Applicable due to no such divestments during the semi-annual period covered since
the previous Form N-CSR filing.

Item 7 – Disclosure of Proxy Voting Policies and Procedures for Closed-End Management
Investment Companies – Not Applicable to this semi-annual report

Item 8 – Portfolio Managers of Closed-End Management Investment Companies – Not Applicable to
this semi-annual report

Item 9 – Purchases of Equity Securities by Closed-End Management Investment Company and
Affiliated Purchasers – Not Applicable

Item 10 – Submission of Matters to a Vote of Security Holders – The registrant’s Nominating and
Governance Committee will consider nominees to the Board recommended by shareholders
when a vacancy becomes available. Shareholders who wish to recommend a nominee
should send nominations which include biographical information and set forth the
qualifications of the proposed nominee to the registrant’s Secretary. There have been no
material changes to these procedures.

Item 11 – Controls and Procedures

11(a) – The registrant’s principal executive and principal financial officers or persons performing
similar functions have concluded that the registrant’s disclosure controls and procedures (as
defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the
“1940 Act”)) are effective as of a date within 90 days of the filing of this report based on the
evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act
and Rule 13a-15(b) under the Securities Exchange Act of 1934, as amended.

11(b) – There were no changes in the registrant’s internal control over financial reporting (as
defined in Rule 30a-3(d) under the 1940 Act) that occurred during the second fiscal quarter
of the period covered by this report that have materially affected, or are reasonably likely to
materially affect, the registrant’s internal control over financial reporting.

Item 12 – Exhibits attached hereto

12(a)(1) – Code of Ethics – Not Applicable to this semi-annual report

12(a)(2) – Certifications – Attached hereto

12(a)(3) – Not Applicable

12(b) – Certifications – Attached hereto


Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment
Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by
the undersigned, thereunto duly authorized.

BlackRock MuniYield Pennsylvania Insured Fund

By: /s/ Donald C. Burke
Donald C. Burke
Chief Executive Officer of
BlackRock MuniYield Pennsylvania Insured Fund

Date: June 23, 2008

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment
Company Act of 1940, this report has been signed below by the following persons on behalf
of the registrant and in the capacities and on the dates indicated.

By: /s/ Donald C. Burke
Donald C. Burke
Chief Executive Officer (principal executive officer) of
BlackRock MuniYield Pennsylvania Insured Fund

Date: June 23, 2008

By: /s/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BlackRock MuniYield Pennsylvania Insured Fund

Date: June 23, 2008