In the beginning there was nothing... No wait, there was something. There was an RSS-feed creation tool called Feeder. And then there was podcasting. Ok now combine this with a developer who updates his software so fast that he must be psychic, and you get probably the best and most used podcast/rss-feed creating App out there.

App name: Feeder (1.35)

Developer: Reinventedsoftware

Promocode in podcast: yes

(win one of three licenses for this app, and there will also be a promo code! I know, I know, we're throwing stuff out here)