NBC has a great article on podcasting, and the author of the article totally gets it!
Here is an excerpt:
...a new idea has sprung up in recent months that promises to change the way listeners view radio in much the same way that Napster changed the landscape of the music business and Tivo altered the viewing habits of millions of TV owners.
"Podcasting" is a term that is probably unfamiliar to most people, but it represents a real potential change in the radio landscape. A small group of enthusiasts has begun cobbling together a way to easily share homemade radio shows, eventually allowing people to reach large numbers of listeners by completely bypassing the current structure of radio.