Touch Typing Software recommendations

Since the keyboard is the interface we use to the computer, I've always thought touch typing should be something I should learn, but I've always been, well, lazy is the word. So, anyone recommend any good touch typing software?

It's easy enough to google, but I'ld like to hear recommendations.

Typing of the Dead!

It's a good few years old so you may have to hunt around, but it's a lot of fun and as well as the main game there are numerous minigames to practice specific areas you may be weak on.