Andrew Grumet and Martijn Venrooy have put together a very cool server-based application called GigaDial that let's you create your own custom Podcast feed from other feeds. Here's one I did that has a podcast from Adam Curry and one from the Gillmor Gang. As I find other things that are interesting to me, I can add them. I could create a custom feed for students to listen to or for my employees. I think there will be lots of applications for this.