Rope Rig
I made this rope rig at a friends request.  It uses joints attached to a motion path to allow it a great deal of flexibility.  I still intend to add the ability for it to properly deform as it squashes and stretches.  I am also working on a script to automate the building of similar rigs.  This rig works in Maya 8 and up.  Grab The Rig Here.

Ball with Tail Rig

Your basic ball with a tail.  Get the rig

Bucket Head

A twist on the ball with legs rig.  Great for learning walk cycles. 
This rig is in the shop for repairs.