Leo put me onto to FeedBurner, he recently switched his podcast feeds over to it so I thought I'd check it out and see what it was all about.
Its pretty darn cool, it takes an existing RSS or Atom feed, creates one link for it so you only have to maintain one file on your server, it will auto create podcast RSS enclosures, and insert Amazon ads into the feeds among many other cool features -- and its only in 'beta'. Check it out.