Bluetooth Laser Virtual Keyboard.

From the website:

This tiny device laser-projects a keyboard on any flat surface... you can then type away accompanied by simulated key click sounds. It really is true future magic at its best. You'll be turning heads the moment you pull this baby from your pocket and use it to compose an e-mail on your bluetooth enabled PDA or Cell Phone. With 63 keys and and full size QWERTY layout the Laser Virtual Keyboard can approach typing speeds of a standard keyboard... in a size a little larger than a matchbook.

Link (Thanks David R!)