We appeared to have a brief RSS feed misconfiguration for a little bit. I think it's fixed. I HOPE it's fixed! Perhaps iTunes humors the n00bs who have less than 15 podcasts, and once you go over that number- and, perhaps, show a tenacity not seen in many 'casters- they decide that you damn well better get the feed right.
So now the RSS checker shows happiness. And iTunes shows a nice little blue dot next to the unlistened-to podcast. So I'm happy. Are you happy?! I am.