I’m pleased to report that Adobe has teamed up with Google on 3D, enabling Photoshop CS3 Extended to browse the Google 3D Warehouse, then download 3D models right into Photoshop. The upshot is that Photoshop users now have direct access to a large & growing repository of free, community-driven 3D content.
The plug-in and more info are available on Adobe Labs. (Note: The team is working to fix a bug found in the Windows version at the last minute. Therefore the Mac plug-in is up now, and the Windows version should be up tomorrow.)