PS. to add to the previous selection on podcasts in education here's another really elegant solution from James Farmer and one of the Deakin lecturers - make sure you watch the short Flash movie that explains the concept and use of podcasts!
I'm going to provide you with a few links, so you can explore for yourself the potential here for learning!
Don't know what podcasting is? Here's a definition from Wikipedia:
Podcasting is a way of publishing files to a website (often a blog) that allows users to subscribe to the site and receive new files as they are posted. Most podcasts are spoken word audio created by individuals, often on a particular theme... Because new files are downloaded automatically by subscribers, podcasting allows individuals to have a self-published, syndicated radio show.
Users subscribe to podcasts using podcast reader software, which periodically checks for and downloads new content. It can then sync these to the user's portable music player, hence the portmanteau of Apple's "iPod" and "broadcasting." However, podcasting does not require an iPod: any digital audio player or computer with the appropriate software can play podcasts.
Podcasting can be thought of as an audio magazine subscription, in that a subscriber receives programs without having to get them, and can listen to them at leisure.
Does that help? Basically, it's MP3 files that are recorded and you access them (whenever you like) download them - onto your computer or MP3 player (including mobile phones with MP3 players!) and you listen to it whenever it suits you!!!