I'm in beautiful Boston, MA today and tomorrow, for the regional meeting of NCTM. This morning, Jon Choate and I gave a talk on 3D geometry with Google SketchUp. We had one of the larger conference rooms (about 300 capacity), and it was standing room only. At some point they stopped letting people in.
At the booth afterward, people said our talk was the highlight of their day, and that many people spent time at other presentations in the back, downloading and playing with SketchUp.
For the models used in our talk, see our 3D Warehouse collection.
Anyone can design anything in 3D! www.3dvinci.net