The 11 Second Club is a monthly character animation competition open to everyone. It was started to fill the void left by the 10 Second Club and sponsored by Animation Mentor.
Basically, each month the site posts a new 10 second audio clip and you are challenged to create an animation with it. Entries can be in any medium, from CG animation to traditional 2D animation and stop-motion. This is a great way to start developing your character animation skills and building an animation portfolio.
It is a fun challenge and leaves the creative door open to how you use it. The focus is to work on your animation skills and not be held back by the modeling and rigging. Here are the available rigged characters for the following formats, Maya, Blender, 3DSMax, and SOFTIMAGE|XSI. They also suggest to avoid spending a lot of time on lighting/rendering/etc
Here is the actual site address. http://www.11secondclub.com/
Here are a few examples:
