Is drop in home values nearing terminal velocity?

"The best that can be said about S&P/Case-Schiller numbers out today is maybe home prices can’t fall any faster. Prices for Q1 of this year dropped at 19.1%, .9% more than they dropped in the last quarter of ‘08. The 20-city index dropped 18.7% year-over-year, also a record. It fell 18.5% during the last three months of 2008. This index has plummeted 32.2% from its July 2006 peak and has fallen 32 straight months."