The number of single-family homes, condominiums, and townhouses listed for sale dropped 3.3 percent in October compared to the month before. Inventory fell in 22 of the 26 major metropolitan areas surveyed by real-estate brokerage firm ZipRealty. Typically, October sees a slight increase in inventory, as sellers try to beat the seasonal sales downturn. Despite the decrease, inventory was up 13 percent over last year, when home sales were boosted by the home buyer tax credit. Data here. More here.