This piece from Business Week uses data from Zillow to rank the top 30 markets.
"The metros are ranked by the share of homes with rising values in the second quarter compared with the second quarter of 2008. The annual change is the year-over-year change in median values for the metro in Q2 compared with the same period last year. The quarterly change compares the second quarter with the first quarter. The ranking is based on Zillow.com's Q2 Home Value Index, which is the median "Zestimate" for a given geography for a given time period. The Zestimate™ is Zillow's estimated market value of a home. This figure is computed by taking many different data points from public records and entering them in a proprietary formula."