This one starts a java applet that let's you virtually fly over the U.S. Just enter your address or zip and see.

http://www.terrafly.com/

Kind of interesting. I just tried to zoom in on my house, since dc seems to be so "featured". I'm rather surprised that they completely misidentified the main street near my house. Pretty neat toy though, and now I can see how amazingly high property is in my n'hood (from what's on sale anyway).

I got a nice, big, red X. I guess it's acting up at the moment. I'll have to try back later.
Scott