GOOGLE MAPS WITH CRAIGSLIST OVERLAY... PRETTY COOL REAL ESTATE LISTINGS
Got this as a forward, but I couldn't find the original blog post:
Paul Rademacher at the University of North Carolina, who wrote his doctoral dissertation on measuring the perceived visual realism of images, has mashed together Google Maps and Craigslist real estate listings. Excellent idea and perfect implementation—from day one of Google Maps I thought that real estate searching was its destiny, especially if you get Keyhole's satellite imagery involved. Paul does not integrate Keyhole images as Google Maps now does in its original state.
Definitely check out the first link. It's starts with a map of the U.S. and then you can click on a city and go from there. Very cool integration, huh? Props to Paul Rademacher.