If you’re getting the “We’re having technical difficulties” error while submitting your podcast rss feed to the iTunes music store, don’t you believe it! It is your XML.
I use Movable Type to generate my page and it had a bunch of extra namespaces, improper dates, etc that iTunes did not like.
I stripped my feed down to a very small feed, then added in the itms tags needed to make the store happy. I am now submitted 🙂