Here's Trulia's national real estate heat map on the left. You can drill down for more detailed information on states, counties, cities, neighborhoods, and zip codes by clicking on the live map over at their site.
On the right is competitor Zillow's list of million dollar homes by city. There, you can use Zestimates to create all sorts of interesting data on real estate trends.
And over at the ominously titled Housing Doom, there's a list (below) of foreclosed properties by state, based on data on Fannie Mae-owned properties. It's not the list they imagined, dominated as it is by heartland states like Ohio and Michigan, with bubble markets conspicuously absent, at least for the time being. Click on any of these graphics to enlarge.
Your thoughts on what might be behind these trends and patterns?