The low max rig (max, maya)
This is an excellent .max rig that was put together by Peter Starostin

The Fundamentals Work files
These are 8 of the 12 principals of animation, setup in easy to use files with rigs.

The Animation Trials!
These are obstacles set up by Aaron Dabelow that will challenge you to animate a full biped character in different circumstances.

11 Second Club
An awsome site dedicated to character animation. They have a contest every month and they are now sponsored by Animation Mentor!

SimplyCG
A forum dedicated to CG work. A great place to post work and recieve some outside feedback from professionals, students and the average person! Get your name out there!

The 12 principles of animation
You should have these memorized, but in case you don't this is a breakdown by Frank & Ollie.

3D Total's Tutorials
A comprehensive solution to almost any 3d question.

CG Society
A 3d community website of industry professionals. Also some great resources. Get inspired!

Run Cycle Tutorial
This is a basic run cycle tutorial that works for any computer program. A great resource.