Gigapan

Gigapan (short for gigapixel panorama) is a commercialization of a robotics/cs project carried out by Carnegie Mellon and NASA. It's basically a robotic arm that holds your digital camera and takes a mosaic of pictures, coupled with some software that stitches the pictures together to create one giant picture. At $380, it ain't cheap, but several people have gotten their hands on one and have been using them.

Gigapan.org is a site they set up to share these gigapixel pictures, and you can browse through each image like a google maps map. It's really fun to zoom in and see what's going on. My personal favorite is the one of Obama's inauguration: see if you can find the secret service agents, evil Dick Cheney, and the camouflaged snipers on the roof! There's also a host of other beautiful pictures, including ones of a Hawaiian Beach, a trading floor in Chicago, and the Alps.