Similar to NASA's WorldWind, Google Earth is a program that allows you to scroll around the world and zoom in to wherever you like. A number of areas have satellite photography available to a high level of detail (you can see individual cars and stuff).
Google Earth seems to be an improvement on WorldWind because there is really high resolution imagery to a lot of areas around the world, rather than just Washington DC.
1) Software developed by Google which enables you to search the entire globe through satellite images.
2) My new crack.
I could see my car in the driveway with Google Earth.