I really enjoy Infinity Blade 1 and 2 (paid), Words With Friends (free with ads, paid without), Hanging With Friends (free with ads, paid without), Jetpack Joyride (free; or at least it was last I checked), and Temple Run (free; and it's pretty addicting). I never really caught on to the Angry Birds games, they bored me. Cut the Rope isn't too bad, though.