Here are some 3D model libraries:
http://archive3d.net
http://3dbar.net
http://www.3dm3.com/modelsbank/
http://www.3dmodelfree.com/ (recommend, scenes as well)
http://artist-3d.com/ (recommend)

Blender community:
http://www.blender.org/
http://www.blender.org/features-gallery … t-gallery/