Don't know if this demo has been mentioned before (i believe the Photosynth concept has been mentioned in one other thread) - but heres a jaw-dropping video demo of what its all about. Totally stunning! http://www.ted.com/index.php/talks/view/id/129?
Not sure about jaw dropping - but it is an interesting idea. I hope they cleared each and every flickr image they used in that demonstration. That is a drum kit on the stage isn't it? Microsoft are so young and hip