Here's a piece of software that will particularly appeal to those interested in photography. But if you're like me, you'll still find it interesting.
Essentially, it's Microsoft's new image browser and it has far reaching abilities. The tech demo (bear in mind this is pre-beta) is worth playing with to get a feel for the technology. The demo has been around since November of last year so some of you might have seen it before.
Video demonstration of Photosynth at TED conference, March 2007 (http://www.ted.com/index.php/talks/view/id/129)
Live labs Photosynth (http://labs.live.com/photosynth/default.html)