Brent Simmons sums up Podcasting quite well.

inessential.com: Weblog: ‘The value of podcasting’:

“It’s kind of like the difference between email and a fax—a fax is a picture of text, while email is text. A podcast is the sound of words.

But all of that is beside the point—the value of podcasting is that people enjoy it. They like the spoken sound of words.”