Seadragon and Photosynth
Another video presentation from the TED conference earlier this year. A Microsoft initiative, Seadragon and Photosynth can link photos from different photographers of the same place to create hyper-real navigatible views of locations. (Video runs about eight minutes)
Okay, so there are some copyright concerns here (they’re scraping photos out of Flickr), but the ability to recreate something lost based on multiple photos is, well … cool.