Sorry about that. I committed a simple cut and past mistake resulting in the enclosure for the episode for the 11th actually pointing to the file for the preceding episode. This only affected the MP3 feed and the Ogg Vorbis feed, the iTunes feed was correct as was the feed for the web site itself, which also sets the audio source for the embedded flash player.
If you refresh your feed, you should see the fix as a new entry with the correct attachment and an apology added to the original text. It may take a minute or two for the feed changes to propagate through the various server caches that may be between my files and your pod catcher.