Photosynth is a collaboration between Microsoft and the University of Washington based on the research that developed Photo Tourism (shown below) of Noah Snavely (UW), Steve Seitz (UW), and Richard Szeliski (Microsoft Research).
Photo Tourism "is a system for browsing large collections of photographs in 3D."
Photosynth is a new way to view photos on your computer. The software (which is a quick download from Microsoft Live Labs), takes a large collection of photos of a place or an object, analyzes them for similarities, and then displays the photos in a reconstructed three-dimensional space, showing you how each one relates to the next one....scene recognition.
Once you have the software installed, check out some of the sample collections that are available from the Microsoft Live Labs such as: