What if you could take all the pictures of a particular place on Flickr, taken at different angles, and without a 3D model, your computer could stitch the pictures together into a 3D, navigable model where you can zoom in or out, walk around and more?  Enter Microsoft Live Labs' project, "Photosynth"

Update0: On10.Net has a cool interview and more in-depth demo of Windows Live Labs' PhotoSynth here.