Greenwood King's highly sought-after Houston Market Report is an "analysis of home sales in Houston's finest residential neighborhoods."  The report gives general market wide information on the number of sales, average sales price, average days on the market, current inventory and the negotiability in sales price in each of the individual neighborhoods served by Greenwood King (inside the loop and west to the beltway). November 2010's report can be viewed on the link below.
http://www.greenwoodking.com/images/pdf/marketreport11.pdf