I recently tried some of the podcast channels and was very disappointed in that I want to ad my own subscriptions. I decided to take a low-tek approach. I use RoksBox to stream from my desktop. I set up a sync program (synctoy 2.1) to sync the video podcasts iTunes library to a folder on my mongoose server (RoksBox). I have tested this on about 10 different podcasts and it works so far.
Anyway I thought I would pass this along.