According to the New York State Association of REALTORS® the August 2008 sales fell 20% compared to August of 2007.  The August 2008 median was $225,000 10% lower that the August 2007 median of $249,000.  In Westchester County the numbers are:

The median prices in August 06 was      $749,000
                                  August 08         $730,000
                                  July 08              $730,000

August 06-August 08     -2.6%
August 07-August 08     -1.4%
July 08-August 08         -1.4%
August 06-August 08     -3.9%

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