Looking for something completely different (bio-processors) I found an article in New Scientist about city simulations from photographs posted by the public on Flickr. The simulations have a watercolour impressionist feel about them.
The simulations were constructed using photographs posted by people of landmarks, and took hours rather than the weeks or month that one would expect for people to find, organise and position hundreds of pictures. The future possibilities as the software evolves, are mindblowing. Maybe one day it will be possible to explore the world virtually without leaving your armchair... set training operations in real landscapes... the potential uses for this are quite amazing.