Wow, delivering videos via an app.. This is so hostile. Why would somebody do it this way and not publish on some video site like vimeo or omg coursera, khan academy etc?
I think the problem with those sites it's that they have some kind of profit. Either by hosting ads or by selling some certificate, where iTunes U really offers the course for "free" on compatible platforms. Maybe this is the focus of Standford
And Apple wants to sell iPads or else why would this site not even support Macs.
Khan academy was non-profit I thought and ad-free. But I get what you are saying, haven't thought about that.