Fracture, if you haven't already found this elsewhere, I happened to bump into this topic again tonight and thought you'd like to know that one of our fellow synthers, Christoph Hausner, has build a pointcloud downloader which you can download here: http://pspcexporter.codeplex.com/
Also relevant to your interests are:
1) the ARC3D service, located here: http://www.arc3d.be/
2) research from the University of Washington where Photo Tourism was born:
3) the ability to apply this process to your own photo collections via the relatively new site run out of UW: PhotoCity. Uploading is temporarily shut down until 2010 April 30, and the process of getting started it a little more complex than Photosynth, but the beauty is that you can continue adding photos to a synth and growing it as you please, as well as seeing a dense model.