Nifty new doodad
Check out this Google Maps mashup with home sales data from Metropolitan Regional Information Systems: It lets you see where the sales are -- whether all sales or, say, everything priced above $1 million.
It's a heat map, which means the areas with the most sales are brightest.
Baltimoresun.com web developer Stephen Mekosh made it. I'd be interested to know if you see other nifty housing-related web tools.