There is a good article here from SMH.com.au about podcasting, one of the iPodder Python programmers and the future of podcasting.
However, the best part (in my opinion) of this article is the diagram at the very top. If you are not interested in reading more about a programmer and podcasting, at least click through and check out their cartoon drawing titled “Podcasting: The DIY Guide to a Revolution”. The diagram actually does a pretty decent job of explaining the podcasting process in a simple form.