Photosynth is a free software, available and open to the public since August 21, developed by the teams of Microsoft Live Labs and researchers of the University of Washington. It is based on a very interesting concept : create a virtual 3D scene from a collection of photographs (minimum 20 photos) of a same place, photos taken from different point of view, but containing at least one common element (a door, a tree, a wall, a corner of heaven...) at the edges.  

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Hmm... A really cool information man... Thanks

Very interesting software...