I saw an internal demo of Photosynth Overhead View a while back and it’s now live. Thanks to Liveside for the heads up :)
Check out the synth of the Burj Dubai and click on the marked “toggle overhead view” (second to last icon). Now you not only get an overhead pin view but a lens that you can move around the pinpoints to see what is below. It’s easier to understand if you use it so click on over there or check out the video below
Photosynth Overhead View from Microsoft Photosynth on Vimeo.