Google Satellite Maps
Google Maps has gotten that much cooler. Google has integrated wonderful satellite imagery into both it's Maps and Local products. It's pretty dang slick, and Greg shows some samples of its power.
Note that I had trouble with the zoom in Firefox 1.01, but after upgrading to 1.02, it all works fine and dandy.
Update at 1:45: Here's a cool flickr group that shows Google images of people's childhood homes (inspired by this). There's also links to the Burning Man Camp site as well as a field in Illinois that says "Dave." Thanks Waxy.