iTorrent allows you to download BitTorrent podcasts from iTunes. It
transforms BitTorrent podcasts so that you can update them just like
any other podcast in iTunes. iTorrent also has the ability to smooth
out the downloads for non-BitTorrent podcasts as well, so that you do
not get frequent timeouts in iTunes when it updates multiple podcasts
at once.
Technical Details: iTorrent runs as an RSS proxy on your local machine
and will fetch enclosures from a BitTorrent network on behalf of
iTunes. The BitTorrent content will then be fed to iTunes via a
standard HTTP connection.