Once I went to a media training class and one of the guidelines of knowing something is more than a trend is when it appears three times. I went to an ipod learn-in, I clicked on the link sent by George and I was reading a magazine and it gave the pratical reason for creating a podcast. I haven't done it just yet but I am working on it. I found this on a web site and it explains it better than I ever could. It is under the green bar heading: tutorials and ipod 101 & 201