A quote from the site: "Not only is podcasting fun, it is an extremely valuable educational tool that has endless possibilities to share learning materials with a vast audience!"
Pod casting is very easy to do, once you do your first one. All you need is some type of recording device (your computer, an iPod, your cell phone) , something to record (your class, how to solve a math problem, directions for an assignment) and a place to host your files!
About.com has a tutorial that is pretty good. It can be found by clicking here.