Thanks, I didn't know about those. Typewith.me looks pretty well done. My friend and I actually used to use flockdraw when we wanted to draw free body diagrams

Thanks, I didn't know about those. Typewith.me looks pretty well done. My friend and I actually used to use flockdraw when we wanted to draw free body diagrams and circuits. It would be interesting to see, though, how integrating a such a drawchat system into Khan Academy would play out, considering how fast the community is growing and the type of audience it is developing.