Podcasts are huge at the moment. Can see them becoming bigger and bigger.
I listen to a lot.
Mainly tech, motoring and Joe Rogan.
For my motoring I listen to the smoking tire and hooniverse
For my tech I listen to techs message and the twit network (loads on there)
And joe Rogans podcast (comedian and UFC commentator) has such a huge variety of guests on ranging from scientists to comedians to a humiliatrix. My favourites are the comedians when they get high as a kite and go down some strange rabbit holes!
I drive around 800 + miles a week so that lot keeps me going. Most of joe's are around 3 hours long