That's neat -- I like the way the pen looks see-through-interpolated-y. But I've got to say: it's pretty creepy when you open your mouth and it goes flying in every direction!

Framerate: I've done some projects in Processing where the sketch, the webcam, and the output video are all at different framerates... I know how mixing these things gets weird sometimes :) If you want to do real-time processing/capture and playback, pick a framerate and use it for MovieMaker (in the new MovieMaker() arguments), the sketch (using frameRate()) and the webcam (I've found JMyron captures frames from my webcam with less overhead than the "built in" webcam libraries).

That's probably more than you were curious to know though :)