The New York Times > Technology > Circuits > Basics: Now, Audio Blogs for Those Who Aspire to Be D.J.'s: "What do the pope and Paris Hilton have in common? They're both podcasters - and you can be one too.
Ranging from the sublime to the ridiculous, podcasts are essentially do-it-yourself recorded radio programs posted online. Anyone can download them free, and, using special software, listeners can subscribe to favorite shows and even have them automatically downloaded to a portable digital music player."
Timely overview of podcasting processes and programs