I've enrolled in 3 Coursera classes as a kind of warm-up for (possibly) going back to school to study computer science (if my start-up succeeds before then). They are:
Reply to this comment or PM me if you are interested in collaborating.
I'm thinking of doing all three, though I might skip 2 since I'm already doing things along those lines.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.