Want to do continuing education with your mp3 player of choice? UC Berkeley is podcasting several of its courses. Lots of science courses (general biology, chemistry, ecology, physics), electrical engineering & computer science, as well as some social sciences & humanities like art, history, and a philosophy course called Existentialism in Literature and Film.
I'm listening to Animal Behavior and am learning lots.
The feed list lets you download various podcasts, only some of which are also avaiable via iTunes.
This is a nice idea; hopefully more institutes of higer education will start doing it!