It is a little off topic but I thought many of the forum goers might find the Photosynth to 3D process I've been working on useful for creating 3D models from aerial photos. The process is pretty simple and FREE:
· Gather images with a lot of overlap (like most of our aerial shots)
· Use this exporter to extract the point cloud http://pspcexporter.codeplex.com/
Here are two examples from my work in Ecuador and West Texas:
https://www.youtube.com/user/mdwillis01#p/u/6/nJgvLll57f0 (only part of this one was done with Photoysnth).
The images were captured from kite and balloon platforms but the same workflow should work for any series of photographs.
Also, here is a Google Earth file with some of the same data http://220.127.116.11/~mwillis/Puchara_Grande.kmz (~10 Mb). My linux box connection is slow. It'll take a bit to download.