I was learning Dvorak on a mac so there weren't a huge number of options, but I found a typing tutor called Master Key with a Dvorak option and that did the trick. You can get it from http://macinmind.com/
There are lots of general Dvorak resources out there and more tutors for PCs if you have one. It's has some quite dedicated followers.
Whpearson recently mentioned that people in some other online communities frequently ask "what are you working on?". I personally love asking and answering this question. I made sure to ask it at the Seattle meetup. However, I don't often see it asked here in the comments, so I will ask it:
What are you working on?
Here are some guidelines