Typing on a tablet can be annoying, and even the tablet-sized keyboards aren't much better. AirType, still in development, is a set of cuffs you wear on your hands that become an invisible keyboard. They learn the motion of your hands as you type, allowing you to type free of restricting screen or hardware sizes.
• AirType: Revolutionary ‘Invisible’ Keyboard of Tomorrow | Design Milk
(Image credits: AirType)