Blender
Blender is a 3D modeling and animation application, combine 3d animation, effects, and more to create complete 3D features. Blender also currently has a fully featured built in game engine. Free and open source.
This is the site that hosts the "user" versions of Blender, free and open source, complete with game engine and Python scripting.
http://blender3d.org
Blender.org has development discussion, news, and the CVS for this open source program.
http://blender.org
Blender Tutorials and background information.
http://www.vrotvrot.com/xoom/index.html
This was interesting, a kind of for users by users guide?
http://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro