I've been learning to podcast. I wrangled with the software and hardware for an inordinant time, and finally produced 2 short (30 seconds or so) little "broadcasts".
I use the Mac GarageBand, which, once you meander through the Help screens, is surprisingly easy to use. It's one of those applications that makes you look so much better than you really are.
I decided to start after buying an IPod Shuffle (the cheap little one), and finding that there are many, many free programs. I've been enjoying NASA, tech-related podcasts, and political shows.