On episode 6 of Inside the Net, they interview Tim Westergren of Pandora Media. He did a 'little' thing called the Music Genome Project. Great idea.
Leo says someone should do that for Podcasting and I have to agree.
A set of tags or attributes that would let people sort and search on podcasts would be helpful for the whole 'community' of podcasting.
Of course, I am not sure what those tags would be or who would be best to determine them, but it is a great idea.