TouchFire: The Screen-Top Keyboard for iPad

This is an interesting design project called the TouchFire.

From the website.

TouchFire puts the "touch" back into typing on an iPad. You can now feel where the keys are and rest your fingers on the home row, so you can type as fast and accurately as you can on a laptop. You can even type without looking at the screen. TouchFire cushions your fingers as you type, something both touch-typists and two-finger typists really appreciate. Typing on an iPad is no longer a pain!

TouchFire is ultra-thin and weighs less than an ounce. It attaches to the inside of the iPad cover and folds with the cover, so you can always keep TouchFire with your iPad without it getting in the way.