Whats the difference between Google Maps, Bing Maps and Yahoo Maps?
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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!