Bowling Night…
I set up an example blog for podcasting at wordpress.com. The media files are on my server (zerokidz) because you can’t upload mp3’s to wordpress.com without a space upgrade.
feed: http://bowlingnight.wordpress.com/category/podcast/feed
This is what you would copy into iTunes (file | subscribe to podcast) to make it work:
http://bowlingnight.wordpress.com/feed/
Note that the url contains the category: podcast, and the word ‘feed’.
Its probably worth trying to run the feed through feedburner as well. Apparently they are set up to handle more of the meta data.