Sketchcast is a rather nifty little tool that is featured in this week's Chronicle, allowing users to basically record an audio track over whiteboard drawings. Very handy for an alternative animation approach and also, presumably for those teaching mathematics or solving equations, etc. The only problem, and from playing with it I think its a signifcant one, is that drawing with a mouse is pretty awful and you probably need a pen /tablet type device to get the most out of this kind of tool. Certainly that's always been an issue with computer art anyway, but try writing text and numbers with a mouse on click-and-drag.....argh! However, if you do buy a pen/tablet (and they are pretty inexpensive) and have a microphone, well the world's your oyster as they say!