Microsoft Labs has made their Photosynth technology public.  It's still in early stages, but the results are pretty cool.

Photosynth includes a downloadable synth creator, and a synth viewer web browser plugin.  Using the software, you can take a bunch of your photographs which are of common objects and/or locations, and link them together in a sort of "virtual reality" thing.

I did have my computer lock up on me the first time I viewed the Taj Mahal synth.

I saw this same sort of technology 2 months ago on Panoramio.  I'm not sure if it's the same technology, or if it's competing.  In this site, people don't create their own viewings.  Instead, it's either handled automatically, or the staff link the photos amongst those of different photographers.

This gives me an idea to try to create a Myst type of game using this technology :).

Bring me the blue pages.