Check out dvassist if you are a dvorak user and you are using Windows. Since I use dvorak as my keyboard layout I can't type on qwerty to save my life, I use this program whenever I come in contact with a Windows computer. The program is light-weight, at only ~500kb, and it just sits in your task bar and allows you to toggle between your current layout and the dvorak layout!
For those of you who want to check out the dvorak keyboard layout, this site has a lot of good information. On qwerty I would max out my typing at ~40WPM, now with dvorak I can hit speeds of +115WPM.
Check out the typing test.