I recommend hard switching over to Dvorak if you really want to learn the layout as fast as possible. Most OS's have an easy way to switch the keyboard over to whatever layout you want. Play as much typing of the dead as you can. I used this program: http://typingsoft.com/stamina.htm when I felt like practicing while watching tv or whatever.
I stuck to Dvorak until I got to around 60wpm before I began switching back and forth between the two. I used qwerty when I played games online, dvorak for everything else. It was super hard the first few weeks or so, but after a while you are able to switch on the fly.
Nowadays I use dvorak for everything as I'm probably faster at it than I am at qwerty. That being said, I can still use qwerty when I'm on someone else's computer. Just takes me a few minutes to warm up.