Someone made a thread recently, about what kind of learner are you. I ended up being Tactile. Not sure what that means exactly, but it recommended that you always do something while studying (pacing, walking, music in background).
Well, recently I took to listening to recorded lectures while running (gonna try swimming soon as I figure out a way to waterproof my I-pod).
but anyway, for me, 60 min of listening to lecture while driving or running is more efficient then 60 min of studying at a desk.
I don't know why, its a bit counter intuitive, but if you are one of those people, def. look into it. You have to concentrate on the material however, i'm not referring to osmosis here.