Poseidon Z Touch keyboard has a touch-sensitive spacebar
 

Many modern keyboards already come festooned with RGB LEDs and more processing power than a lunar lander. Thermaltake thinks it's time to update the humble spacebar now, too. The company has placed a programmable touch surface on the spacebar of its Poseidon Z Touch mechanical keyboard. Through this input area, users can access some of the functions of a multi-touch trackpad without lifting their hands off of the keyboard.

http://techreport.com/news/29889/pos...itive-spacebar