FLAHERTY & CRUMRINE PREFERRED INCOME OPPORTUNITY FUND

To the Shareholders of Flaherty & Crumrine Preferred Income Opportunity:

     Stating the obvious, we are facing extraordinary and unprecedented times in
the financial markets. The events that ultimately culminated in the government's
massive financial rescue plan have impacted the market for preferred securities
particularly hard. As a result, for the quarter ended August 31, 2008, the
Fund's common shareholders experienced a total return on net asset value of
-14.1%, subsequent to the quarter-end and through the date of this letter, the
net asset value has continued to decline significantly.

     Prices on long-term US Treasury bonds rose during the quarter, as investors
sought the safety of government bonds despite historically low yields. On the
flip side, there were few buyers and abundant sellers of most preferred
securities and corporate bonds. A downward cycle for prices ensued, as selling
pressure pushed prices lower which in turn led to more selling pressure.

     This pattern of selling begetting selling is an effect of severe bear
market psychology. In addition, investors and lenders, seeking the safety and
security of cash, withhold capital from borrowers. Since the free flow of
capital is essential to our economy, and economic growth is a key factor in
security valuation, concerns about price declines become self-fulfilling. The
bears clearly were in control both during and subsequent to the quarter.

     The root cause of the current financial problems remains
unresolved-residential real estate markets have yet to stabilize. The
speculative component of residential housing has resulted in "bubble and crash"
cycles in the past, but the current adjustment is unlike any we can recall. Far
too many people wanted to buy homes under the "greater fool" plan and lenders
were far too willing to help. The real estate market will eventually return to
equilibrium and the dramatic measures taken by the government will help calm the
markets. In the meantime we must deal with circumstances at hand.

     Since the end of our fiscal quarter events have transpired at a
breathtaking pace - particularly relating to the Fund's use of leverage and its
dividend. Our website allows for much more frequent communication than our
quarterly letters. We have posted updates throughout this financial crisis and
we encourage you to continue visiting us at www.preferredincome.com.

     In addition to managing your Fund, we are also shareholders. We understand
your concerns about recent events and we are doing our best to respond to them.
Nonetheless, our goals remain constant - conduct exhaustive research and
construct an investment portfolio that is designed to deliver high current
income consistent with the objectives and guidelines of the Fund.

Sincerely,


/s/ Donald F. Crumrine                  /s/ Robert M. Ettinger

Donald F. Crumrine                      Robert M. Ettinger
Chairman of the Board                   President

October 16, 2008



Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
PORTFOLIO OVERVIEW
AUGUST 31, 2008 (UNAUDITED)



FUND STATISTICS ON 8/31/08
--------------------------
                               
Net Asset Value                   $      7.36
Market Price                      $      7.25
Discount                                 1.49%
Yield on Market Price                   11.26%
Common Stock Shares Outstanding    11,833,198




MOODY'S RATINGS                   % OF PORTFOLIO
---------------                   --------------
                               
AA                                      4.4%
A                                      11.5%
BBB                                    57.0%
BB                                     21.4%
Below "BB"                              0.2%
Not Rated                               3.4%
                                       ----
Below Investment Grade*                18.5%


*    BELOW INVESTMENT GRADE BY BOTH MOODY'S AND S&P.

                                   (PIE CHART)



INDUSTRY CATEGORIES               % OF PORTFOLIO
-------------------               --------------
                               
Banking                                 22%
Energy                                   7%
Financial Services                      14%
Insurance                               16%
Other                                    5%
REITs                                    2%
Utilities                               34%




TOP 10 HOLDINGS BY ISSUER         % OF PORTFOLIO
-------------------------         --------------
                               
Interstate Power & Light               5.8%
Liberty Mutual Group                   4.5%
Merrill Lynch                          4.4%
Southern California Edison             3.6%
Sovereign Bancorp                      3.5%
Puget Energy                           3.1%
Entergy Louisiana                      2.9%
Metlife                                2.8%
Banco Santander                        2.8%
CIT Group                              2.6%




                                                                                          % OF PORTFOLIO**
                                                                                          ----------------
                                                                                       
Holdings Generating Qualified Dividend Income (QDI) for Individuals                             56%
Holdings Generating Income Eligible for the Corporate Dividend Received Deduction (DRD)         51%


**   THIS DOES NOT REFLECT YEAR-END RESULTS OR ACTUAL TAX CATEGORIZATION OF FUND
     DISTRIBUTIONS. THESE PERCENTAGES CAN, AND DO, CHANGE, PERHAPS
     SIGNIFICANTLY, DEPENDING ON MARKET CONDITIONS. INVESTORS SHOULD CONSULT
     THEIR TAX ADVISOR REGARDING THEIR PERSONAL SITUATION.


                                        2



              Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
                                                        PORTFOLIO OF INVESTMENTS
                                                     AUGUST 31, 2008 (UNAUDITED)



SHARES/$ PAR                                                                                                      VALUE
------------                                                                                                  ------------
                                                                                                     
PREFERRED SECURITIES -- 95.4%
               BANKING -- 21.7%
$  3,000,000   Astoria Capital Trust I, 9.75% 11/01/29, Series B ...............................              $  3,020,100
               Banco Santander:
     178,200      6.50% Pfd. ...................................................................                 3,569,578**(1)
      36,800      6.80% Pfd. ...................................................................                   788,900**(1)
$  2,400,000   Capital One Capital III, 7.686% 08/15/36 ........................................                 1,781,760
$  4,500,000   CBG Florida REIT Corporation, 7.114%, 144A**** ..................................                 1,407,600
      25,000   Citigroup, Inc., 8.50% Pfd., Series F ...........................................                   538,000*
      19,648   Citizens Funding Trust I, 7.50% Pfd. 09/15/66 ...................................                   246,828
      45,000   Cobank, ACB, 7.00% Pfd., 144A**** ...............................................                 1,478,700*
$  3,500,000   Comerica Capital Trust II, 6.576% 02/20/37 ......................................                 1,992,200
       4,500   FBOP Corporation, Adj. Rate Pfd., 144A**** ......................................                 2,475,000*
$  2,250,000   First Hawaiian Capital I, 8.343% 07/01/27, Series B .............................                 2,172,600(1)
       1,750   First Tennessee Bank, Adj. Rate Pfd., 144A**** ..................................                   918,750*
$    450,000   HBOS PLC, 6.657%, 144A**** ......................................................                   282,915**(1)
       4,400   HSBC Series II, Variable Inverse Pfd., Pvt. .....................................                         0*+
       2,500   HSBC USA, Inc., $2.8575 Pfd. ....................................................                    97,825*
               JPMorgan Chase & Co.:
      10,000      6.15% Pfd., Series E .........................................................                   394,800*
$    250,000      7.90%, Series I ..............................................................                   227,825*
      60,000   Keycorp Capital IX, 6.75% Pfd. 12/15/66 .........................................                   903,750
      99,000   National City Corporation, 9.875% Pfd. ..........................................                 1,948,320*
      28,000   PFGI Capital Corporation, 7.75% Pfd. ............................................                   441,560
$  2,500,000   Regions Financing Trust II, 6.625% 05/15/47 .....................................                 1,322,000
       3,200   Regions Financing Trust III, 8.875% Pfd. 06/15/78 ...............................                    69,920(2)
     212,700   Sovereign Bancorp, 7.30% Pfd., Series C .........................................                 3,409,858*
      20,375   Sovereign Capital Trust V, 7.75% Pfd. 05/22/36 ..................................                   372,710(2)
       1,850   Sovereign REIT, 12.00% Pfd., Series A, 144A**** .................................                 1,764,641
               U.S. Bancorp, Auction Pass-Through Trust, Cl. B:
           9      Series 2006-5, Variable Rate Pfd., 144A**** ..................................                       225*+
           9      Series 2006-6, Variable Rate Pfd., 144A**** ..................................                       225*+
      60,000   Wachovia Corporation, 8.00% Pfd., Series J ......................................                 1,118,400*
$    900,000   Washington Mutual Preferred Funding IV, 9.75%, 144A**** .........................                   403,560
$  1,400,000   Webster Capital Trust IV, 7.65% 06/15/37 ........................................                   903,420
                                                                                                              ------------
                                                                                                                34,051,970
                                                                                                              ------------
               FINANCIAL SERVICES -- 14.2%
               CIT Group, Inc.:
      10,000      5.189% Pfd., Series B ........................................................                   460,800*
     261,200      6.35% Pfd., Series A .........................................................                 3,667,901*



                                        3



Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
PORTFOLIO OF INVESTMENTS (CONTINUED)
AUGUST 31, 2008 (UNAUDITED)



SHARES/$ PAR                                                                                                      VALUE
------------                                                                                                  ------------
                                                                                                     
PREFERRED SECURITIES -- (CONTINUED)
               FINANCIAL SERVICES -- (CONTINUED)
     160,000   Countrywide Capital IV, 6.75% Pfd. ..............................................              $  2,410,000(2)
      12,000   Countrywide Capital V, 7.00% Pfd. 11/01/36 ......................................                   178,500
         890   First Republic Preferred Capital Corporation, 10.50% Pfd., 144A**** .............                   940,926
      22,500   First Republic Preferred Capital Corporation II, 8.75% Pfd., Series B,
                  144A**** .....................................................................                   519,750
               Goldman Sachs:
      20,000      Adj. Rate Pfd., Series C .....................................................                   323,750*
     175,000      Adj. Rate Pfd., Series D .....................................................                 2,723,438*
      24,680      Cabco Trust Capital I, Adj. Rate Pfd. 02/15/34 ...............................                   346,569
          11      Pass-Through Certificates, Class B, 144A**** .................................                         0*+
       3,500      STRIPES Custodial Receipts, Pvt. .............................................                        35*+
               Lehman Brothers Holdings, Inc.:
      45,800      5.67% Pfd., Series D .........................................................                 1,257,668*
       9,500      5.94% Pfd., Series C .........................................................                   257,830*
      25,000      6.50% Pfd., Series F .........................................................                   376,500*
      13,400      7.95% Pfd. ...................................................................                   208,504*
               Merrill Lynch:
     112,000      Adj. Rate Pfd., Series 5 .....................................................                 1,323,000*
       3,000      Series II STRIPES Custodial Receipts, Pvt. ...................................                        30*+
     200,000      6.25% Pfd. ...................................................................                 3,562,000*
      30,000      8.625% Pfd., Series 8 ........................................................                   640,200*
               SLM Corporation:
       4,000      Adj. Rate Pfd., Series B .....................................................                   161,500*
      94,150      6.97% Pfd., Series A .........................................................                 2,985,497*
                                                                                                              ------------
                                                                                                                22,344,398
                                                                                                              ------------
               INSURANCE -- 13.8%
$  1,000,000   AMBAC Financial Group, Inc., 6.15% 02/15/37 .....................................                   353,300
$  3,250,000   AON Capital Trust A, 8.205% 01/01/27 ............................................                 3,043,407
               Arch Capital Group Ltd.:
      10,000      7.875% Pfd., Series B ........................................................                   231,563**(1)
      24,400      8.00% Pfd., Series A .........................................................                   559,675**(1)
      29,700   Axis Capital Holdings, 7.50% Pfd., Series B .....................................                 2,323,431(1)
      90,000   Delphi Financial Group, 7.376% Pfd. 05/15/37 ....................................                 1,577,817
$  3,250,000   Everest Re Holdings, 6.60% 05/15/37 .............................................                 2,151,500
               Liberty Mutual Group:
$  4,500,000      7.80% 03/15/37, 144A**** .....................................................                 3,359,250
$    250,000      10.75% 06/15/58, 144A**** ....................................................                   227,800



                                        4



              Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
                                            PORTFOLIO OF INVESTMENTS (CONTINUED)
                                                     AUGUST 31, 2008 (UNAUDITED)



SHARES/$ PAR                                                                                                      VALUE
------------                                                                                                  ------------
                                                                                                     
PREFERRED SECURITIES -- (CONTINUED)
               INSURANCE -- (CONTINUED)
$    500,000   MetLife Capital Trust X, 9.25% 04/08/38, 144A**** ...............................              $    507,450
     186,600   MetLife, Inc., 6.50% Pfd., Series B .............................................                 3,919,067*
$    200,000   PartnerRe Finance II, 6.44% 12/01/66 ............................................                   154,440(1)
               Renaissancere Holdings Ltd.:
      42,050      6.08% Pfd., Series C .........................................................                   740,080**(1)
      56,700      6.60% Pfd., Series D .........................................................                 1,111,320**(1)
     115,500   Scottish Re Group Ltd., 7.25% Pfd. ..............................................                   245,438**(1)+
$  1,060,000   USF&G Capital, 8.312% 07/01/46, 144A**** ........................................                 1,140,194
                                                                                                              ------------
                                                                                                                21,645,732
                                                                                                              ------------
               UTILITIES -- 34.3%
               Alabama Power Company:
       4,980      4.60% Pfd. ...................................................................                   388,639*
       6,485      4.72% Pfd. ...................................................................                   519,189*
         868      4.92% Pfd. ...................................................................                    72,443*
       1,579   Baltimore Gas & Electric Company, 6.70% Pfd., Series 1993 .......................                   155,800*
      92,000   Calenergy Capital Trust III, 6.50% Pfd. 09/01/27 ................................                 4,125,280
       5,560   Central Vermont Public Service Corporation, 8.30% Sinking Fund Pfd., Pvt. .......                   572,902*
               Connecticut Light & Power Company:
       2,050      4.50% Pfd., Series 1956 ......................................................                    75,399*
      25,000      5.28% Pfd., Series 1967 ......................................................                 1,102,000*
       2,000   Consolidated Edison Company of New York, 4.65% Pfd., Series C ...................                   163,920*
      40,000   Constellation Energy Group, Inc, 8.625% Pfd. 06/15/63, Series A .................                 1,003,200
$  1,750,000   Dominion Resources, Inc., 7.50% .................................................                 1,587,775
      15,030   Duquesne Light Company, 3.75% Pfd. ..............................................                   434,066*
      90,000   Entergy Arkansas, Inc., 6.45% Pfd. ..............................................                 2,223,000*
      46,000   Entergy Louisiana, Inc., 6.95% Pfd. .............................................                 4,582,520*
       4,400   Florida Power Company, 4.75% Pfd. ...............................................                   363,880*
               Georgia Power Company:
       8,000      6.125% Pfd. ..................................................................                   195,680*
       6,500      6.50% Pfd., Series 07-A ......................................................                   644,410*
       2,000   Great Plains Energy, Inc., 4.35% Pfd. ...........................................                   156,720*
               Hawaiian Electric Company, Inc.:
       2,471      5.00% Pfd., Series D .........................................................                    43,011*
       7,438      5.00% Pfd., Series E .........................................................                   129,468*
       1,383      5.00% Pfd., Series I .........................................................                    24,073*
      30,500   Indianapolis Power & Light Company, 5.65% Pfd. ..................................                 2,637,030*
     336,400   Interstate Power & Light Company, 8.375% Pfd., Series B .........................                 9,096,256*



                                        5



Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
PORTFOLIO OF INVESTMENTS (CONTINUED)
AUGUST 31, 2008 (UNAUDITED)



SHARES/$ PAR                                                                                                      VALUE
------------                                                                                                  ------------
                                                                                                     
PREFERRED SECURITIES -- (CONTINUED)
               UTILITIES -- (CONTINUED)
               Pacific Enterprises:
      15,935      $4.50 Pfd. ...................................................................              $  1,259,343*
       8,935      $4.75 Pfd., Series 53 ........................................................                   745,268*
$  1,500,000   PECO Energy Capital Trust III, 7.38% 04/06/28, Series D .........................                 1,482,150
      14,020   Public Service Electric & Gas Company, 5.28% Pfd., Series E .....................                 1,334,564*
$  5,750,000   Puget Sound Energy, Inc., 6.974% 06/01/67 .......................................                 4,821,375
      21,635   San Diego Gas & Electric Company, $1.70 Pfd. ....................................                   535,466*
               South Carolina Electric & Gas Company:
      13,711      5.125% Purchase Fund Pfd., Pvt. ..............................................                   706,117*
       7,774      6.00% Purchase Fund Pfd., Pvt. ...............................................                   396,629*
               Southern California Edison:
      25,000      6.00% Pfd., Series C .........................................................                 2,290,000*
      35,000      6.125% Pfd. ..................................................................                 3,289,300*
               Southern Union Company:
$  1,780,000      7.20% 11/01/66 ...............................................................                 1,421,686
       6,575      7.55% Pfd. ...................................................................                   167,046*
$    750,000   TXU Electric Capital V, 8.175% 01/30/37 .........................................                   600,075
               Union Electric Company:
       5,700      4.56% Pfd. ...................................................................                   445,797*
      10,156      $7.64 Pfd. ...................................................................                   991,835*
               Virginia Electric & Power Company:
       3,878      $6.98 Pfd. ...................................................................                   384,310*
      12,500      $7.05 Pfd. ...................................................................                 1,267,969*
$  1,700,000   Wisconsin Energy Corporation, 6.25% 05/15/67 ....................................                 1,409,351
                                                                                                              ------------
                                                                                                                53,844,942
                                                                                                              ------------
               ENERGY -- 6.3%
$  4,000,000   Enbridge Energy Partners LP, 8.05% 10/01/37 .....................................                 3,565,436
$  2,500,000   Enterprise Products Partners, 7.034% 01/15/68 ...................................                 2,171,757
       3,000   Kinder Morgan GP, Inc., 8.33% Pfd., 144A**** ....................................                 3,085,020*
      10,000   Lasmo America Limited, 8.15% Pfd., 144A**** .....................................                 1,015,000*(1)
                                                                                                              ------------
                                                                                                                 9,837,213
                                                                                                              ------------
               REAL ESTATE INVESTMENT TRUST (REIT) -- 2.1%
      65,000   Duke Realty Corporation, 8.375% Pfd., Series O ..................................                 1,536,600
               PS Business Parks, Inc.:
      10,000      6.70% Pfd., Series P .........................................................                   186,250(2)
      59,400      6.875% Pfd., Series I ........................................................                 1,128,600
       7,500      7.20% Pfd., Series M .........................................................                   150,704



                                        6



              Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
                                            PORTFOLIO OF INVESTMENTS (CONTINUED)
                                                     AUGUST 31, 2008 (UNAUDITED)



SHARES/$ PAR                                                                                                      VALUE
------------                                                                                                  ------------
                                                                                                     
PREFERRED SECURITIES -- (CONTINUED)
               REAL ESTATE INVESTMENT TRUST (REIT) -- (CONTINUED)
               Public Storage, Inc.:
      10,500      6.75% Pfd., Series E .........................................................              $    220,172
       5,500      6.75% Pfd., Series L .........................................................                   116,875
                                                                                                              ------------
                                                                                                                 3,339,201
                                                                                                              ------------
               MISCELLANEOUS INDUSTRIES -- 2.7%
      13,600   E.I. Du Pont de Nemours and Company, $4.50 Pfd., Series B .......................                 1,107,448*
      35,000   Ocean Spray Cranberries, Inc., 6.25% Pfd., 144A**** .............................                 3,159,450*
                                                                                                              ------------
                                                                                                                 4,266,898
                                                                                                              ------------
               U.S. GOVERNMENT AGENCY -- 0.3%
      55,000   Fannie Mae, Adj. Rate Pfd., Series P ............................................                   529,100*
                                                                                                              ------------
                                                                                                                   529,100
                                                                                                              ------------
               TOTAL PREFERRED SECURITIES
                  (Cost $190,166,686) ..........................................................               149,859,454
                                                                                                              ------------
               CORPORATE DEBT SECURITIES -- 2.5%
               INSURANCE -- 2.2%
$  4,417,000   Liberty Mutual Insurance, 7.697% 10/15/97, 144A**** .............................                 3,478,829
                                                                                                              ------------
                                                                                                                 3,478,829
                                                                                                              ------------
               ENERGY -- 0.3%
      19,500   Nexen, Inc., 7.35% Subordinated Notes ...........................................                   460,079(1)
                                                                                                              ------------
                                                                                                                   460,079
                                                                                                              ------------
               TOTAL CORPORATE DEBT SECURITIES
                  (Cost $4,835,608) ............................................................                 3,938,908
                                                                                                              ------------
OPTION CONTRACTS -- 0.2%
         150   December Put Options on December U.S. Treasury Bond Futures,
               Expiring 11/21/08 ...............................................................                   234,375+
                                                                                                              ------------
               TOTAL OPTION CONTRACTS
                  (Cost $262,010) ..............................................................                   234,375
                                                                                                              ------------
SECURITIES LENDING COLLATERAL -- 1.9%
   3,025,332   BlackRock Institutional Money Market Trust ......................................                 3,025,332
                                                                                                              ------------
               TOTAL SECURITIES LENDING COLLATERAL
                  (Cost $3,025,332) ............................................................                 3,025,332
                                                                                                              ------------



                                        7



Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
PORTFOLIO OF INVESTMENTS (CONTINUED)
AUGUST 31, 2008 (UNAUDITED)


                                                                                                     
TOTAL INVESTMENTS (Cost $198,289,636***) .......................................................   100.0%     $157,058,069
OTHER ASSETS AND LIABILITIES (Net) .............................................................     0.0%           47,932
                                                                                                   -----      ------------
TOTAL NET ASSETS AVAILABLE TO COMMON AND PREFERRED STOCK .......................................   100.0%++   $157,106,001
                                                                                                   -----      ------------
AUCTION PREFERRED STOCK (APS) REDEMPTION VALUE .................................................               (70,000,000)
                                                                                                              ------------
TOTAL NET ASSETS AVAILABLE TO COMMON STOCK .....................................................              $ 87,106,001
                                                                                                              ============


----------
*    Securities eligible for the Dividends Received Deduction and distributing
     Qualified Dividend Income.

**   Securities distributing Qualified Dividend Income only.

***  Aggregate cost of securities held.

**** Securities exempt from registration under Rule 144A of the Securities Act
     of 1933. These securities may be resold in transactions exempt from
     registration to qualified institutional buyers. These securities have been
     determined to be liquid under the guidelines established by the Board of
     Directors.

(1)  Foreign Issuer.

(2)  All or a portion of this security is on loan.

+    Non-income producing.

++   The percentage shown for each investment category is the total value of
     that category as a percentage of net assets available to Common and
     Preferred Stock.

ABBREVIATIONS:

PFD. -- Preferred Securities

PVT. -- Private Placement Securities


                                        8



              Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
                 STATEMENT OF CHANGES IN NET ASSETS AVAILABLE TO COMMON STOCK(1)
        FOR THE PERIOD FROM DECEMBER 1, 2007 THROUGH AUGUST 31, 2008 (UNAUDITED)



                                                                                VALUE
                                                                            ------------
                                                                         
OPERATIONS:
   Net investment income ................................................   $  9,049,395
   Net realized gain/(loss) on investments sold during the period .......     (3,053,082)
   Change in net unrealized appreciation/depreciation of investments ....    (28,552,710)
   Distributions to APS* Shareholders from net investment income,
      including changes in accumulated undeclared distributions .........     (3,026,812)
                                                                            ------------
   NET DECREASE IN NET ASSETS RESULTING FROM OPERATIONS .................    (25,583,209)

DISTRIBUTIONS:
   Dividends paid from net investment income to Common Stock
      Shareholders(2) ...................................................     (7,217,562)
                                                                            ------------
   TOTAL DISTRIBUTIONS TO COMMON STOCK SHAREHOLDERS .....................     (7,217,562)

FUND SHARE TRANSACTIONS:
   Increase from shares issued under the Dividend Reinvestment and Cash
      Purchase Plan .....................................................        820,339
                                                                            ------------
   NET INCREASE IN NET ASSETS AVAILABLE TO COMMON STOCK RESULTING FROM
      FUND SHARE TRANSACTIONS ...........................................        820,339
                                                                            ------------
NET DECREASE IN NET ASSETS AVAILABLE TO COMMON STOCK FOR THE PERIOD .....   $(31,980,432)
                                                                            ============
NET ASSETS AVAILABLE TO COMMON STOCK:
   Beginning of period ..................................................   $119,086,433
   Net decrease in net assets during the period .........................    (31,980,432)
                                                                            ------------
   End of period ........................................................   $ 87,106,001
                                                                            ============


----------
*    Auction Preferred Stock.

(1)  These tables summarize the nine months ended August 31, 2008 and should be
     read in conjunction with the Fund's audited financial statements, including
     footnotes, in its Annual Report dated November 30, 2007.

(2)  May include income earned, but not paid out, in prior fiscal year.


                                        9



Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
FINANCIAL HIGHLIGHTS(1)
FOR THE PERIOD FROM DECEMBER 1, 2007 THROUGH AUGUST 31, 2008 (UNAUDITED)
FOR A COMMON STOCK SHARE OUTSTANDING THROUGHOUT THE PERIOD.


                                                                                        
PER SHARE OPERATING PERFORMANCE:
   Net asset value, beginning of period ................................................   $     10.14
                                                                                           -----------
INVESTMENT OPERATIONS:
   Net investment income ...............................................................          0.77
   Net realized and unrealized gain/(loss) on investments ..............................         (2.68)

DISTRIBUTIONS TO APS* SHAREHOLDERS:
   From net investment income ..........................................................         (0.26)
                                                                                           -----------
   Total from investment operations ....................................................         (2.17)
                                                                                           -----------
DISTRIBUTIONS TO COMMON STOCK SHAREHOLDERS:
   From net investment income ..........................................................         (0.61)
                                                                                           -----------
   Total distributions to Common Stock Shareholders ....................................         (0.61)
                                                                                           -----------
   Net asset value, end of period ......................................................   $      7.36
                                                                                           ===========
   Market value, end of period .........................................................   $      7.25
                                                                                           ===========
   Common Stock shares outstanding, end of period ......................................    11,833,198
                                                                                           ===========
RATIOS TO AVERAGE NET ASSETS AVAILABLE TO COMMON STOCK SHAREHOLDERS:
   Net investment income+ ..............................................................          7.68%**
   Operating expenses ..................................................................          2.03%**

SUPPLEMENTAL DATA:++
   Portfolio turnover rate .............................................................            52%***
   Total net assets available to Common and Preferred Stock, end of period (in 000's) ..   $   157,106
   Ratio of operating expenses to total average net assets available to Common and
      Preferred Stock ..................................................................          1.21%**


(1)  These tables summarize the nine months ended August 31, 2008 and should be
     read in conjunction with the Fund's audited financial statements, including
     footnotes, in its Annual Report dated November 30, 2007.

*    Auction Preferred Stock.

**   Annualized.

***  Not Annualized.

+    The net investment income ratios reflect income net of operating expenses
     and payments to APS Shareholders.

++   Information presented under heading Supplemental Data includes APS.


                                       10



              Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
                                                FINANCIAL HIGHLIGHTS (CONTINUED)
                                           PER SHARE OF COMMON STOCK (UNAUDITED)



                          TOTAL                                   DIVIDEND
                        DIVIDENDS   NET ASSET        NYSE       REINVESTMENT
                           PAID       VALUE     CLOSING PRICE     PRICE(1)
                        ---------   ---------   -------------   ------------
                                                    
December 31, 2007 ...    $0.0680      $ 9.64        $ 9.46         $ 9.64
January 31, 2008 ....     0.0680       10.23         10.25          10.23
February 29, 2008 ...     0.0680        9.94         10.06           9.94
March 31, 2008 ......     0.0680        8.65          9.09           8.65
April 30, 2008 ......     0.0680        8.93          9.47           9.00
May 31, 2008 ........     0.0680        8.80          9.90           9.41
June 30, 2008 .......     0.0680        8.10          9.30           8.83
July 31, 2008 .......     0.0680        7.39          7.77           7.39
August 31, 2008 .....     0.0680        7.36          7.25           7.35


----------
(1)  Whenever the net asset value per share of the Fund's Common Stock is less
     than or equal to the market price per share on the reinvestment date, new
     shares issued will be valued at the higher of net asset value or 95% of the
     then current market price. Otherwise, the reinvestment shares of Common
     Stock will be purchased in the open market.


                                       11



Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)

1.   AGGREGATE INFORMATION FOR FEDERAL INCOME TAX PURPOSES

     At August 31, 2008 the aggregate cost of securities for federal income tax
purposes was $198,176,947, the aggregate gross unrealized appreciation for all
securities in which there is an excess of value over tax cost was $3,570,966 and
the aggregate gross unrealized depreciation for all securities in which there is
an excess of tax cost over value was $44,689,844.

2.   ADDITIONAL ACCOUNTING STANDARDS

     STATEMENT OF FINANCIAL ACCOUNTING STANDARDS NO. 157 "FAIR VALUE
MEASUREMENTS" ("SFAS 157")

     In September 2006, the Financial Accounting Standards Board issued SFAS 157
effective for fiscal years beginning after November 15, 2007. This standard
clarifies the definition of fair value for financial reporting, establishes a
framework for measuring fair value and requires additional disclosures about the
use of fair value measurements. The Fund has adopted SFAS 157 as of December 1,
2007. The three levels of the fair value hierarchy under SFAS 157 are described
below:

     - Level 1 - quoted prices in active markets for identical securities

     - Level 2 - other significant observable inputs (including quoted prices
                 for similar securities, interest rates, prepayment speeds,
                 credit risk, etc.)

     - Level 3 - significant unobservable inputs (including the Fund's own
                 assumptions in determining the fair value of investments)

     The inputs or methodology used for valuing securities are not necessarily
an indication of the risk associated with investing in those securities. A
summary of the inputs used to value the Fund's net assets as of August 31, 2008
is as follows:



                                                                    OTHER FINANCIAL
                                                                      INSTRUMENTS
                                                     INVESTMENTS      (UNREALIZED
                                                    IN SECURITIES    APPRECIATION/
VALUATION INPUTS                                   (MARKET VALUE)    DEPRECIATION)*
----------------                                   --------------   ---------------
                                                              
Level 1 - Quoted Prices - Investments ..........    $ 39,428,049          $--
Level 2 - Other Significant Observable Inputs ..     114,604,688           --
Level 3 - Significant Unobservable Inputs ......              --           --
                                                    ------------          ---
TOTAL ..........................................    $154,032,737          $--


*    Other financial instruments are derivative instruments not reflected in the
     Schedule of Investments, such as futures, forwards and swaps which are
     valued at the unrealized appreciation/depreciation on the investment. As of
     August 31, 2008 the Fund does not have any other financial instruments.


                                       12



              Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
                           NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)

3.   SECTION 19 NOTICES

     Section 19 of the Investment Company Act of 1940 requires registered
investment companies to include a notice with the payment of a dividend if a
portion of that dividend may come from sources other than undistributed net
income (other sources could include realized gains from the sale of securities
and non-taxable return of capital). Copies of the Section 19 notices for the
Fund are available on the website at www.preferredincome.com.

     The amounts and sources of distributions reported below are only estimates
and are not being provided for tax reporting purposes. Form 1099-DIV will be
sent to shareholders in January 2009 reporting the amount and tax
characterization of distributions for the 2008 calendar year.



                                            SOURCE OF DISTRIBUTIONS AS OF 08/31/08
                                       ------------------------------------------------
                                           NET           NET         RETURN   TOTAL PER
                                       INVESTMENT      REALIZED        OF      COMMON
                                         INCOME     CAPITAL GAINS   CAPITAL     SHARE
                                       ----------   -------------   -------   ---------
                                                                  
Calendar 2008 Distributions ........    $0.5256         $0.00       $0.0184     $0.544
Percentage of Total Distributions ..       96.6%          0.0%          3.4%        --


4.   SUBSEQUENT EVENTS

     On September 7, 2008, Fannie Mae was placed into conservatorship. The value
of preferred stock issued by this entity, which was held by the Fund, has been
adversely impacted and is not reflected in this report. From August 31, 2008 to
September 25, 2008, when the Fund sold its remaining position, the decrease in
value totaled $425,700.

     On September 15, 2008, Lehman Brothers Holdings Inc. filed for bankruptcy.
On September 26, 2008, Washington Mutual Inc. filed for bankruptcy. As a result,
the Fund may not be able to recover the principal invested in securities issued
by these entities, and also does not expect to receive income payments on these
securities going forward. The value of securities issued by these entities,
which were held by the Fund, has been adversely impacted and may decline
further. The decline since August 31, 2008 is not reflected in this report.

     Subsequent to the reporting period, the market values of certain
investments of the Fund have declined significantly and may decline further as a
result of the ongoing financial crisis. The market value of the Fund's
investments is reflected in the weekly net asset values reported by the Fund.

     The Funds are subject to several different asset coverage requirements that
arise from the use of leverage by the Fund. The decline in asset values has
resulted in the Fund not meeting these asset coverage requirements at various
points in time since the end of the fiscal quarter. According to these
requirements, the Fund may not declare, set aside, or pay a common stock
dividend unless the asset coverage requirements are met. The Fund has delayed
the payment of the September common stock dividend as a result. To meet the
requirements and pay the delayed dividend and future dividends, the Fund has
been selling assets to raise cash, and has applied much of the proceeds to the
reduction of


                                       13



Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)

leverage or invested in higher quality short-term securities in anticipation of
future reductions in leverage. On October 1, 2008, the Fund announced the
redemption of $10 million of auction preferred stock that was redeemed on
October 14, 2008. The Fund may be adversely impacted by the reduction in
leverage. Updated information on the status of these requirements may be found
on the Fund website at www.preferredincome.com.


                                       14



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                           (FLAHERTY & CRUMRINE LOGO)
                       PREFERRED INCOME OPPORTUNITY FUND

                                Quarterly Report

                                 August 31, 2008

                             www.preferredincome.com

DIRECTORS
   Donald F. Crumrine, CFA
      Chairman of the Board
   David Gale
   Morgan Gust
   Karen H. Hogan
   Robert F. Wulf, CFA

OFFICERS
   Donald F. Crumrine, CFA
      Chief Executive Officer
   Robert M. Ettinger, CFA
      President
   R. Eric Chadwick, CFA
      Chief Financial Officer,
      Vice President and Treasurer
   Chad C. Conwell
      Chief Compliance Officer,
      Vice President and Secretary
   Bradford S. Stone
      Vice President and
      Assistant Treasurer
   Laurie C. Lodolo
      Assistant Compliance Officer,
      Assistant Treasurer and
      Assistant Secretary

INVESTMENT ADVISER
   Flaherty & Crumrine Incorporated
   e-mail: flaherty@pfdincome.com

QUESTIONS CONCERNING YOUR SHARES OF FLAHERTY & CRUMRINE PREFERRED INCOME
OPPORTUNITY FUND?

     -    If your shares are held in a Brokerage Account, contact your Broker.

     -    If you have physical possession of your shares in certificate form,
          contact the Fund's Transfer Agent & Shareholder Servicing Agent --

               PNC Global Investment Servicing
               (U.S.) Inc.
               P.O. Box 43027
               Providence, RI 02940-3027
               1-800-331-1710

THIS REPORT IS SENT TO SHAREHOLDERS OF FLAHERTY & CRUMRINE PREFERRED INCOME
OPPORTUNITY FUND INCORPORATED FOR THEIR INFORMATION. IT IS NOT A PROSPECTUS,
CIRCULAR OR REPRESENTATION INTENDED FOR USE IN THE PURCHASE OR SALE OF SHARES OF
THE FUND OR OF ANY SECURITIES MENTIONED IN THIS REPORT.