NASA World Wind is a program that I recently discovered while working on guestMap ideas. World Wind is an open-source program that NASA has created that allows the user to place different types of overlays on an extemely high quality globe of the Earth. The user can spin the globe and zoom in on the Earth at a street level.
Overlays include landmarks, borders, weather, hurricane paths, the Lewis and Clark trail, USGA maps, and many other downloadable add-ons. Since World Winds is open-source, add-ons have already started popping up on the internet. A good site is World Wind Wiki.
Another great feature of World Wind is the ability to link to if from a webpage. Once you have downloaded World Wind, click 
to find Area 51 or using USGS Urban Area Ortho to see an airplane.
A cool site to check out is the hotspots forum. This forum is a list of all the "Easter Eggs" that people have found in World Winds.
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