Do you want to record a podcast, not just listen to one? Did you know it can take up to 6 hours to edit a 15-minute podcast? It can if you do it right. Do, ah, um, a, like, do you, uh, really, like well, want all those, uh, well, you know, do you really really want THOSE awful things (ums, wells, etc.) in your podcast? (They are bad enough from radio announcers who should know better, but even worse with less seasoned speakers.) Then edit them out.
If you want to know how law librarians (who like their ducks in a row, please) learn how to podcast and how you might do so yourself, see this terrific article by Rita Kaiser of the King County Law Library in the Law Librarians of Puget Sound (LLOPS) Winter 2007 newsletter, starting on page 7. There are lots of other articles out there in cyberspace by lawyers who podcast, including but not limited to this one and this one.