Flash cards can turn any “down time” into study time. If you're standing in line, waiting for a movie to start, or sitting in a waiting room, whip out your cards and expand your vocabulary. Go through the cards in bunches of ten to twenty. Start by looking at the foreign word first and trying to recall the English meaning. When you can do that perfectly, reverse the process and translate from English to the target language until I know all the words in the stack cold. Keep a stack of cards you've mastered out where you can see it and watch it grow. Watching your “done” stack mount higher and higher is a great little motivator.