PimpRig posted a review up on a unique and versatile input device from Ergodex called the DX1.

To place a key, first you peel off the protective cover off of the adhesive, then press it down firmly on the DX1 pad. To remove the key, simply twist it off. The instructions say not to pry, but I tried it anyway. I pried as hard as I dared, and the damn thing wouldn't budge. Gave it a twist, and off it came.

Ergodex DX1 Input System Review