There is this one site that sells a keyboard with blank keys...I suppose that could make you a better typist over time. With that keyboard you could also probably remap the keys to dvorak if you please, but it may not be the best idea for learners, but who knows.

A dvorak keyboard is a great idea, as I hear people usually double their typing speeds from a qwerty. However, one thing that's usually a problem is that you sorta loose your ability to type on a qwerty keyboard as you learn dvorak. This can be a problem if you tend to use other keyboards other than your own, such as at work or at school, or even if you own a laptop.