Doc Searls has done a great job of pulling together many topics related to radio, iPods, audioblogs, RSS, the NAB and Ogg Vorbis.
PODcasting will shift much of our time away from an old medium where we wait for what we might want to hear to a new medium where we choose what we want to hear, when we want to hear it, and how we want to give everybody else the option to listen to it as well.
Update: Dave Slusher is trying to set the record straight and make sure we’re using the terminology correctly. I think he’s got it right. It ain’t a PodCast (or even a PODcast) if it doesn’t flow automatically (automagically) from source to MP3 player.