Oxford and Cambridge universities are both now offering free content via iTunes U on the iTunes Store. The free content includes videos, podcasts, music tracks, and other content from multiple contributors, some of which are Nobel Prize winners.
Obviously, you will need access to the iTunes store via a computer to get the free content, but not necessarily an iPod to play the content on the go. The universities see the content as a marketing opportunity.
The two prestigious educational institutions hope that the content will help provide background to students who are interested in attending the university.