superior layout), Z-Type might prove a nice way to practice your typing skills while having a bit of fun.
It's a basic shooter game: Spaceships come at you from the top, and you need to shoot and destroy them before they hit the bottom and destroy you. You do the shooting by typing the words associated with the baddies: Each spaceship has one word, and every letter sends a shot aimed at it. Once you finish typing the word, the ship explodes.
The graphics are very nice, and when you're done with the game it shows you your score and accuracy. The only thing I didn't like about this game is that it wouldn't let me set the speed, and it seems to be aimed at novice typists. If I could just select the level of difficulty before starting to play, I suspect it would have been much more engaging.
Still, for novice typists it's a great little way to practice!
[This was the Community Choice winner in the Mozilla Labs Game On 2010 competition! -Ed]