Podcasting is about recording audio in MP3 and posting it on the web. Software detects the recording and adds it to a syndication database. Other software helps you find and download the MP3. Then you play it.
I was trying to figure out how I could use this. I have a lot of CME to listen to, not to mention music. The only thing I could think of were children's stories. If someone were very good at reading kids stories I'd love to have the audio for car trips and doctors visits.
There are, as my friend Lin would point out, some significant intellectual property issues with that scenario.