The Standard & Poor’s/Case-Shiller 20-City Home Price Indices shows prices dropped 1.0 percent in January from December 2010 and decreased 3.1 percent year-over-year. Still, the index, which measures the average value of single-family housing in 20 major metropolitan areas, is up 1.1 percent from its April 2009 low. Cities where foreclosures dominate the market experienced more downward pressure on prices, while cities such as San Diego and Washington D.C. posted year-over-year gains. More here and here.