Podcasts offer a new dimension in teaching English! Tutors and trainers might get some ideas for classes too.
You need iTunes on your computer to play the podcasts. If you don't have it yet, go to
http://apple.com and click on the tab that says iPod+Itunes. That will bring up a page with a link to iTunes. That will bring up a page with a button that says Download iTunes. Podcast.com will ask you to sign up.