Yet another 3D photo wonder is now available - Microsoft Photosynth is available for preview

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Try it here: https://labs.live.com/photosynth. It is an interesting approach of building a 3D world from a bunch of 2D photos taken anywhere.

Coincidentally, Microsoft just released 3D maps in Windows Live Local, which also succeed to build 3D models of cities simply by getting data from a camera floating around in a plane.