This game is getting mentioned all over the place in the last few days. I finally gave in and tried it, despite what sounded like a boring concept to me.
Truth is, it's done very well and is a fun way to practice your typing.
The concept is very simple, you and other people online type the same block of text to advance your cars along a line. The fastest typer wins. Very low tech visuals but it's a very clean interface and the multiplayer part just works well and helps motivate you.
The best part of it is probably that the text you type is selected from books and movies, and after you complete a "race" the page tells you about the text you just typed. It's a great way to make it more entertaining.