I'd never heard of it, but I've just signed up for one via iTunes U. These look awesome. It will be interesting to see where the world of education goes in the next decade. Personally I'm looking for resources for younger children (5-15) for my own children
This is one of the only things that really annoys me about these courses, is that they are often only available via iTunes U. I don't have, nor do I want, iTunes. I shouldn't have to fire up a VM to access "open" content. I deal with it but it bugs the crap out of me.
This is available outside of iTunes on YouTube (I think). I understand your reasoning, but as I do have iTunes it makes a very nice, seamless way of subscribing to their content, which can then be shared across my various devices (iphone / iPad etc). I even have a projector in my lounge attached to a Mac Mini that I've started using for this rather than just for movies