Don't remember the iPhone App Store PodCaster-gate sega? We envy you. Long story short, Apple rejected PodCaster for duplicating iTunes functionality (downloading podcasts), then added that functionality to iTunes with iPhone OS 2.2. A short time back, a newly stripped down (and less user-friendly -- thanks Apple!) version of PodCaster finally made it into the App Store as RSS Player.
And for today, it's FREE [iTunes link]!
(Thanks to forum superstar Jamesus for pointing this out!)