Typing Links on the Web

Dance Mat Typing

Touch Typing

Typing test
 

I haven't tried these, but here are some that others have suggested:

http://www.learn2type.com/

http://www.freetypinggame.net/

http://www.freetypinggame.net/play.asp

http://www.freetypinggame.net/free-typing-lesson.asp

http://www.freetypinggame.net/free-typing-test.asp

http://www.typeonline.co.uk/typingspeed.php

http://kids.learn2type.com/TypingTest

http://www.typingweb.com/typingtutor/typing_test.php

http://www.goodtyping.com/