Tux Typing 2 (7.9mb install version 1.5.3) is an educational typing tutor for children. It features several different types of gameplay, and a variety of difficulty levels and you can even add more words. Downloads available for Windows, Mac OS X and Linux and has several language settings. Tux is the Linux penguin mascot and is known to pop up in other games.
Homepage
http://tuxtype.sourceforge.net
Tuxmath and Tuxpaint also availabe from this site.