I've never really gotten into podcasts. If the idea is just to get information, I'd rather read, because I can read a lot faster than people can talk and I can go back to review if something wasn't clear the first time.
A few years back, I was spending a lot of time on the road and listened to a lot of podcasts because reading and driving don't mix. Perhaps now with satellite radio things are better, but finding an interesting local station that wasn't 90% commercials was always a chore. These days most of my driving is within range of Montreal, Ottawa, and Toronto broadcast stations I am familiar with, but still they seem to be very heavy on the advertising. It is just that I am only on the road a few times a year so getting into podcasts has too much overhead. I agree however that reading is generally preferable.