Before TIVO, I had thought for a long time that it would be nice to be able to record a radio show and play when I want (this is called time shifting). The future is here in Podcasting. People upload their own podcast (sounds like broadcast). You download it, load it on your MP3 player, and play it when and where you want.
I haven't listened to any of them yet. We'll see how it goes, but I believe this is the future of grassroots, back to basics media.