Some links, to lazy to linkify them, sorry.
http://www.feedforall.com/podcasting-tutorial.htm
http://www.makezine.com/02/podcast/
One thing about Podcasting. If I host the MP3 files on my website wouldn't that be costing me a bunch of money when people download from there? Let's say I have 10 mb of an MP3 file and 1000 people download it. Wouldn't I be charged for 10 gigs of download?