I'm a big fan of Massive Open Online Courses (MOOCs). I think they'll ultimately revolutionize the way that Universities operate, and they're certainly making them rethink things already.

I've tried my hand at a few for fun, review and professional development (See: Khan Academy, Coursera and many more), but haven't tied any relating to astronomy. Have you? Have you found a good one?

What about amateur astronomy? Could it reliably be taught by video, or is there just no substitute for getting out there and doing it yourself?