Timon and Pumba Typing Game - http://disney.go.com/disneyinteractive/learning/html/interactives/timonpumbaatyping.html 

Provided by Disney, an interactive keyboarding practice game

Typing Master - http://www.typingmaster.com.au/games.htm 

Free, downloadable typing games

Typing Master Timed Test - http://www.typingtest.com/index.asp?go=typetest_start 

Online timed typing test

Funschool Typing - http://www.funschool.com/games.php?section=g5 

Typing game at Funschool.com, arrow down to find Type Me

Teaching Keyboarding - http://www.angelfire.com/ks/tonyaskinner/kbideas.html 

Ideas for ways to keep students engaged when teaching keyboarding, also includes links at the bottom to free software, but some are dead links

Kids Domain- http://www.kidsdomain.com/brain/computer/type.html 

Links to typing games, downloadable programs, and software reviews

Learn2Type - http://www.learn2type.com/ 

Free website, but requires login and password, also includes timed typing test

Typing Games - http://www.typing-games.com/ 

Download free games

PopCap Word Shark - http://www.popcap.com/

Word Shark is a keyboarding tutor game.  "Zap sharks and piranhas as you dive for sunken treasure!"  Doesn't require a download.