I just read an article at NewScientistTech about a cool software application called 4D Cities, developed by Frank Dellaert and Grant Schindler of Georgia Institute of Technology and Sing Bing Kang of Microsoft Research (His group worked on some of the technologies related to the Photosynth project). The project is being funded by NSF and a Virtual Earth grant from Microsoft. It seems to work like Photosynth, but arranges photo collections of the same area into a temporal sequence. A 3D animation can then be generated to show how the area changed through the time period covered.
Check out the cool animations demonstrating the software on Grant Schindler’s website and the 4D Cities project website.