I've been playing around in Flash after Katie's demo on Tues! The first was an attempt at a character walk cycle, but there's a bit wrong with it in terms of the character holding his form (particularly in the arms), and doesn't really have too much personality yet... He's supposed to be playing a DS while he walks. ;)
The 2nd is a cat walk cycle. I used some reference from Steve Robert's "Character Animation in 3D" for the keys.