Calling all geography fans out there.
NASA’s World Win 1.3 is the program you have been looking for.
Fun Factor: w.o.w
What does it do?
World Wind lets you zoom from satellite altitude into any place on Earth. Leveraging Landsat satellite imagery and Shuttle Radar Topography Mission data, World Wind lets you experience Earth terrain in visually rich 3D, just as if you were really there.
Virtually visit any place in the world. Look across the Andes, into the Grand Canyon, over the Alps, or along the African Sahara.
Very similar to Nasa World Wind, the price is the same too, Free!
MSN Virtual Earth – http://virtualearth.msn.com/
Microsoft’s entry into the map / atlas market