This is cool!  The Evolution Keyboard is a split extended
keyboard that can be used on a desktop or mounted to a chair. It separates
the left and right hand sides of the keyboard into two separate pieces.

Both left and right sides have a Spacebar and a palm rest. A built in
touch pad can be located either on the left or right side depending
on your preference. When mounted to a chair the Evolution Keyboard has
three adjustable planes: wrist rotation, forearm length and keyboard
height, which allows an infinite choice in positioning. Evolution Keyboard
also allows you to re-map its keys.

Via Kinesis