FreeTypingGame has a number of typing options: lessons, games and tests.
Another site with typing test is TypingTest.com.
PlayWithYourMind has some challenging typing games located here.
Cup Stacking can help you type letters.
Play Bubbles to increase your speed!
Enjoy a gentle Rain of letter which turns into a downpour! Can you keep up?
Arachnid Falls is a fast paced spider game featuring ice cream-- yum!
Another spider game: Super Hyper Spider Typer .
Can you type fast enough to defeat the Ghosts?
See how fast you can type letters as they appear on the screen with Find the Letter.
AlphaAttack is a fast paced game that will let you practice your typing skills. Read the directions carefully!
If you are a Star Wars fan, you might like to play Tiep Player to practice letters and words.
Nate G found a demo game which is fun if you like soccer. You can only play for 30 seconds at a time, but you can practice letters and numbers. Goalie
He also found this game, which he says is hard! Barracuda
Try this one if you like typing sentences: Typing Monster
This page has a variety of speed tests using common words. Spelling and Typing Games
Even more games from Nate:
This is a different typing challenge from the ABCYa site.