Podcasts are so old school

For millenials and younger, it's all about vidcasting (videocasting). But even more important, where's the comment box?

In the true spirit of web 2.0, how do you interact with a podcast? On Last.fm, there are recommendations, ratings, comments, community. Podcasts are like television: one way communication.

I'm looking for a site that dialogs in podcasts: "Leave your comment: upload it here!"