If you work at a computer these things are great because you can listen to the shows while you are working. I also download them and listen in the car via a connector to my car stereo.
What I find is that some shows a longer and better suited for listening while working on my computer, others are about a half hour so I listen to those while in the car.
There is anohter show that I actually think is one of the best podcasts out, its called THE SHOOTING BENCH with host Cope Reynolds. He has a radio show in New Mexico and rebroadcasts the show, without commercials, via podcast. You can hear his show at this link:
The Shooting Bench » Blog Archive » The Shooting Bench July 11, 2007
It should also be pointed out that ALL of these shows can be 'subscribed' to via iTunes.