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.
iTorrent runs as an RSS proxy on your local machine and works by automatically fetching enclosures from a BitTorrent network on behalf of iTunes. The BitTorrent content will then be fed to iTunes via a standard HTTP connection.