I listen to them while I am at work. I drive a truck and the regular programming on the radio got real old after a couple of years. It was very near to the time that I became a ham. The first podcast that I listened to was a financial show call "The Tom O'Brien Show". It was a daily 2 hour show that really broke up my drive from Denver, CO to Casper, WY (4 hours+ each way).
I started looking for other shows and found the TWIT network. "This Week In Tech" was a favorite back then (I don't listen to it anymore, though) as well as "Security Now" and "Floss Weekly". These shows really gave my brain something to do during my usually uneventful runs around Colorado and Wyoming.
Here is a list of some of the shows that I have listened to
at one time or another.