I don't know the current versions, but years ago I remember a "chording keyboard" for the HP Palmtop - it was IIRC a handheld device with five or six keys that

I don't know the current versions, but years ago I remember a "chording keyboard" for the HP Palmtop - it was IIRC a handheld device with five or six keys that you typed by pressing keys at the same time. The guy was able to type pretty darn fast with it, one handed.