This [openphotovr.org] is cool. An open source project written by Vladimir Slepnev [livejournal.com] that is similar to Microsoft Photosynth [wikipedia.org]. The photo of Notre Dame linked above is from my Flickr [flickr.com] photostream [flickr.com].
2021.08.01: Photosynth is discontinued, so linking to the Wikipedia page for it. The original link was labs.live.com/photosynth/