Cedric pointed me (again) at a great piece of technology currently emerging from Microsoft
Live Labs. Photosynth is a piece of software which takes a collection of photos
and constructs a 3D space with them. It allows you to move around in this space, see
similar photos and take a tour through constructed imagery from a set of photos. The
website has a couple of videos showing this off and extrapolating the idea in a future
scenario when this software could index all the photos on the Internet and come up
with virtual places for people to explore. Exciting stuff!