Where to get 3D models:

Princeton Model Search Engine
Georgia Tech Large Model Archive
Viewpoint (has some free samples)
Hugues Hoppe (look for links named "Data")
Cyberware
Garland's Cow
Stanford
3D Cafe
Some Asteroids
Canada's Visual Information Technology
CAESAR Data Samples

Some lists like this one:

3DCompression.com
Greg Turk