Ian, interesting analysis. I hope podcasting catches on, but one reason it may not have yet is the lack of immediacy. With online video, the gratification is instant, whereas podcasts are downloaded to a queue for listening later. Also, ripping a CD is a one-time investment with a nearly infinite return, as songs tend to be listened to over and over; podcasts are much more disposable.

I'm also rather surprised at how few people even know what RSS is.