PhotographyBLOG has an interesting post on a technology demo from Microsoft called Photosynth, which stitches together photos into a 3D panorama that you can navigate in. There's some cool -- but still pie in the sky -- thoughts about the massive indexing you might do to navigate the entire world of photos in this way, using your own snapshots as entry points into exploration. The promotional video is at least 50% fluff (you can skip most of the first half), but has some interesting nuggets.