Wikimedia
Wikipedia: Podcasting
Overview of the Internet broadcasting method. Also contains the origin of podcasting, how the term came to be coined, and other uses of podcasting.
BBC
Bbc News: Podcasts Bring Diy Radio to the Web
This BBC article from 2004 describes the basics of podcasting- "an internet-based radio show which podcasters create, usually in the comfort of their own home".It gives background on the origin of podcasting with MTV host, Adam Curry.