Whats the difference between Google Maps, Bing Maps and Yahoo Maps?
All three services offer satellite imagery of the planet, and their imagery quality will differ by area. At this time, Google Maps has better world-wide coverage than Bing Maps, but Bing Maps offers a great Birds-eye view (taken from a low-flying plane) that can get some amazing detail. Yahoo Maps is still in beta, but looking good. The best way is to explore all of them!