Portuguese firm Displax is touring a new technology that could turn virtually any surface into a multi-touch display. Their technology can cover a curved or flat surface, works on top of OLED, e-Ink or LCD, comes up to 120 inches in diagonal length and is all of 100 microns thick. They claim to have 98% transparency, in essence blocking virtually no light/e-Ink from beneath.
Current models have a multi-touch limitation:
Currently, it can detect up to 16 fingers on a 50-inch screen.
Sadly, this does not affect me, as I myself have a 10 finger limitation. Displax currently states shipping will begin as soon as July of this year.