RSS feeds to power your own podcasts.
How is this good for educators? Students can create their own music, own films, own images and put them out there for the public to use. One of the best pieces – they can license their own work: choose Creative Commoons, choose traditional copyright, and more.
What a great exercise in ethical use of media, students can actually decide how their media is used. The though of someone pirating their work makes the discussion of online music/movie piracy much more authentic.