If you are into anki mobile, I fit a good amount of study time walking to and from work, lunch, walking my dog, waiting for food to arrive, waiting in line at trader joes, etc. A few minutes here and there add up to close to an hour of study that would otherwise be wasted doing absolutely nothing. I also started listening to jpod101 dialogs in the car so I get some passive study that way - it's a 45 minute round trip to work and back every day..
