For some reason if you subscribe to the podcast thru iTunes, it's not reading the data correctly. I hope it's just temporary. I verified that it works OK in Bloglines, and iPodder.
UPDATE: I got it working. iTunes is apparently more picky than Bloglines or iPodder about some of the HTML in the podcast file... I had made a mistake in the coding and it was getting rejected. All fixed now!
The latest episode is, "Ask Mark Bateman's Brain."