The orbiTouch is a (very) non-standard input device that allows you to control your computer by manipulating two paddles towards an outer ring. (They slide instead of turn.) By combining the positions of both, a variety of keystrokes, including letters, can be performed. It’s not a replacement for a standard keyboard, but instead an alternative input device for those with disabilities that might prevent them from typing on a standard QWERTY.
It’s also $400, so best reserved for those who really need it.
orbiTouch Keyless Keyboard [OhGizmo]