Phillip Torrone at Engadget has released a Mac-based tutorial for creating Podcasts — audio files that you can subscribe to and automatically download to your iPod.
Although there are more efficient ways to create Podcasts than what is outlined by Torrone, the author set about to do it as inexpensively as possible, using such free (and nearly free) utilities as SoundFlower and SoundBed, Line-In, and Apple’s GarageBand.