According to the Guardian Apple is working on something called 'QuickTime 2 RSS,' which will allow someone (in this case a teacher) to record a lecture and then have it automatically encoded for playback on a video enabled iPod and seeded to an RSS feed,
The goal[...] is to supply millions of people and businesses with their own feed. [...] an easy way to inform friends or clients about their news. No need to send email anymore. Just update the feed, and that’s it.