Getting Graphic is a semi-sort-of-irregular collection of our favorite BIG real estate-related chart(s).
Housedata.info  is a site that has converted the OFHEO Housing Price Index data  for each state and key cities with three different charts: Actual numbers as well as an 8 quarter and 20 quarter moving averages, quarter-over-quarter, year-over-year and deviations from the moving average figures. I am not crazy about the black look of the charts, but its still a great resource.
Its a lot easier to see each market than the OFHEO tables [pdf]  that are released every quarter. The next release (1st Quarter 2006) is slated for June 1.