If you haven't seen Ask A Ninja yet, check it out. I think that the ability to download and watch the podcast while he's biking or running is the main reason Shannon's so thrilled with his 3rd Anniversary!!!! iPod Nano.
It is amazing how expressive this guy is despite the fact his face is completely covered save his eyes. Here's one of my favorites where he answers the question "If celebrities were weapons, what weapons would they be?"
If his manic energy has left you jittery, behold the stealth of the Ninja Cat!