I prefer to actually read books, but I enjoy listening to recorded lectures by The Teaching Company. They have university professors putting together courses, which are then recorded in the Teaching Company studio. They're pretty expensive, but if you catch one on sale, you can usually get the audio download versions for $35 each. (The video DVD versions can go for $800 at normal price
)Well worth it in my opinion! Right now I'm listening to the Roman History lectures. I miss the cameraderie you get actually interacting with a good professor, but I don't miss high tuition costs!