The folks at Eyebeam OpenLab have produced (and released as open source software) OGLE, a very interesting package that:
allows for the capture and re-use of 3D geometry data from 3D graphics applications running on Microsoft Windows. It works by observing the data flowing between 3D applications and the system's OpenGL library, and recording that data in a standard 3D file format. In other words, a 'screen grab' or 'view source' operation for 3D data.
At the site you can view samples of its capabilities, including 3D prints of Google Earth data (pictured) as well as 3D avatar rendering
Via Eyebeam Research