TypeRacer is a really cool online game for typists to race each other in what is one of the coolest typing tutor of all time. Technically speaking, TypeRacer doesn't tutor you but rather lets you practice and compare your typing skills with others from around the world.
TypeRacer is also available as an Orkut application that you can add onto your profile. Users on TypeRacer added through Orkut have a link to their Orkut profiles from within TypeRacer allowing other users to contact them via Orkut.
It's only after about a half hour of typing that I was able to cross 100WPM and that put me at the lower end of the high scores chart. I hope you've been able to do better. I can't imagine how some people manage to exceed 180WPM.