TerraFly, a site provided by Florida International University and sponsored by the National Science Foundation, NASA, the United States Geological Survey, and IBM, contains a huge database of aerial and satellite images of the entire United States. The site includes a satellite link that serves up images of Earth close enough to identify city streets, parks, and other geographical landmarks. Visitors type in any U.S. address, ZIP code, or city and state for a virtual flyover of the area selected.
Photosynth uses hundreds of standard digital camera images to construct a three-dimensional view of an environment or "synth". These synths can be explored much like a video game, allowing you to explore, zoom into tiny details, and see where the photographer was standing (or flying) when they took the pictures.