I'm heading off to Iceland and Sweden in a couple of weeks, and decided to use a coupon I received to get a new GameBoy Advance SP to kill time on the plane. It's pretty sweet, but the games they have for it are simply amazing! Right now I am addicted to Final Fantasy Tactics which is more fun than Dungeon & Dragons ever was... incredible that such a deep and involving game could be fit into the palm of your hand!
If you've got a lot of time to waste, FFT-A is highly recommended! (screenshots were swiped from IGN).