A keyboard with blank keys. According to the Blurb,
Since there is no key to look at when typing, your brain will quickly adapt and memorize the key positions and you will find yourself typing a lot faster with more accuracy in no time. It is amazing how slow typers almost double their speed and quick typers become blazing fast!
Hmmm… Jolly useful for writing blank verse though (sorry). A snip at $79.95.