You probably all know about iTunes u on the iPad and iPhone.
I’ve been trying it out, and so far its excellent.

I’ve been using the stanford iOS course to try out the iTunes U app for both my iPad and my iPhone.

a couple of things that I’ve noticed:

1) you can watch the lecture videos on your apple TV
2) you can read supplied lecture notes at the same time as watching the lecture video on your apple TV
3) you can view the lecture notes (pdf’s) in ibooks by clicking the top right ‘view in’ and picking ibooks [or kindle, etc]

if you have an iPad then I recommend you give it a shot!