The Microsoft Live Labs project Photosynth has just gone live, letting you create your own synths.
What's a synth? Consider taking a whole bunch of your pictures of a certain place, dropping them in Photosynth, and getting a 3D representation of the spatial relationships between those pictures that you can then navigate around.
Or... just think of using tape to join your pictures together. In 3D.
Well, I suppose it's easier to just look at one than to describe it!
Some related stores: