You may find the Podcast Index [1] project interesting, it tries to create an open index of all podcasts, and currently has 4.5M podcasts. It has a downloadable sqlite database and an API.
Haha, the most recently uploaded/indexed "episodes" of a "podcast" on this site are individual songs from what looks like a podcast feed of a radio show. Just kind of funny
dkh|11 months ago
Very cool project
dkh|11 months ago
..which is yet again something I find both interesting and kind of funny (that they have "standardized" the philosophy of "pay what you want")