I’m a huge fan of the courses from The Teaching Company. It’s a great way to make better use of a commute into the city and I’m especially happy that they’re now offering mp4 downloads that you can put on your ipod. I had ordered several courses on CD awhile back, which were great, but managing all of the CDs was a real pain. Now that I know I can just download a course I’ll have to pick up a few more, especially since they’re cheaper than the DVD or CD versions.