Podcasting to the point
Chuq has found an article on podcasting by Darren Barefoot that neatly summarizes why podcasting isn't really much of a revolution.
I myself always saw podcasts as a marriage between weblogs and audio books, but Darren is smart enough to see beyond this and make me go "Duh" by pointing out that a podcast really isn't anything more than timeshifted radio.
The advantage of a podcast over radio is that the web is the distribution channel, which makes it easier to set up your own small private station (while radio frequencies were a scarce and expensive commodity). The disadvantage is that podcasts will end up competing against regular radio stations, who have professional writers, speakers and hardware, and thus suck a lot less.