If you haven't tried the excellent Miro software for subscribing to and promoting your Video and Audio podcasts, it's totally worth it.

They incorporate their own podcast directory (one of the best) and their client can download via bittorrent to save publishers' bandwidth fees. The company that makes miro is non-profit, and the software is open source. They also work with a public radio company to publish their audio podcast directory, and they support the Open Media Project. Can it get any better?
Yes. It can.
Last week they announced a free download for Windows or Mac that will convert videos to several popular formats, such as those suitable for playing on mobile devices. The tool is also open source, based on a normally hard-to-use command-line program called FFMPEG.