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Worldwide Telescope
I'm an instant fan of Microsoft's Worldwide Telescope. What a great idea. Access to tons of astronomical pictures and data at your fingertips. I really enjoy the tours. Some of which are done very professionally, and other's, like one done by a six year old that I listened to, were just for the fun of it. It's nice to see Microsoft getting out there and using some of it's massive resources for the benefit of the community.