Tap Tap Glider This simple game is ridiculously addicting; just when I think that I've gotten as far as possible, I beat my previous score.
Angry Birds Rio This game is awesome; not only are the levels thoroughly entertaining to play but the graphics and animation make it hilarious at times.
Lane Splitter I've yet to find a game as crazily addicting as this one. When I was in high school we would have competitions to see who could get the farthest.
Words With Friends Free Me and about 5 of my good friends have been playing each other for the past year and it never gets old.