When I first saw Photosynth my reaction was "Here is a gimmick looking for a real world application." Today it is just what I need for teaching a forensics class about photographing crime and accident scenes. With Synth you can clearly establish a 360-degree view of the scene, which helps put more detailed photos into overall perspective, visually establish relative positions, and greatly enhance the written documentation that accompanies an investigation.

Another use, be it for a grandchild, an object at home or at a crime scene, is to do a 360-degree Synth around just that person or object to help document it.