Your now can create your own podcast audio or video using the web sites below:
For audio use www.talkshoe.com to create audio podcast with users able to call in. This system uses POTS or VOIP to access system. The client software is only for windows but can be run on LINUX using WINE.
For video use www.ustream.tv. This looks like a mix between U-tube and Myspace. I am planning to try Talkshoe in the new future for a TAC podcast.