The WPM gauge is set to go from 0..120. I didn't expect to have many customers that can type > 100WPM, but perhaps I was mistaken. If anything, I thought that I might end up dialing that down to 0..75, so that most users at the lower-end of the range feel like they're getting a positive result. Maybe I could make that a configurable option in a future release.

As for measuring typing accuracy, that's surprisingly complicated. I wrote up a blog posting on this:

http://quickbrownfrog.wordpress.com/2010/11/22/measuring-typ...

Thanks for the feedback!