I guess it has already been commented somewhere, at least I saw it at laJunglaDigital (although I had seen it before ;) ), but still I think it is an amazing technology.
This time, it comes from Microsoft (or a company it bought recently ;) ) and it is a technology to create 3D environments from a series of digital photographs called Photosynth. For this, it takes regular pictures from any source (cell phones to SLR cameras) and detects the relations between them. With this, it creates the environment which you can navigate being enriched by pictures. So that you can understand it a bit better, below is a video with a demo:
You can do a live demo of the technology at the Photosynth website. It is really amazing, and just imagine the possibilities this opens to!