Typing practice: The Z-type game
I learned how to type with Mavis Beacon Teaches Typing. The game was to type as accurately as possible on a screen that looked like the front seat of a car. If you mistyped a word, a bug hit your windshield. It worked, I suppose. I am typing this as we speak. However, I learned by negative reinforcement. You err, you get a bug in your face. I much prefer the super-addictive game making the rounds on the Web today: Z-type.
For every successful word you type, you explode a rocket ship. Think Atari, but with a skill set at the end of the game. Go play for a few hours.