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Oh right and I forgot to mention, practical example.. I made a combined keyboard / joystick driver for running MAME. So it can press '1', '2', '5', and 'esc' for 1up, 2up, coin insert and return to menu. It also works great as a regular joystick. Since it's just a normal USB human interface...

Sorry I wasn't clear. Bumble-B is pretty much just a straight breakout board for AT90USB162, making it DIP form so it's easier to handle. It also supplies the necessary support circuitry and of course a USB connector. So the datasheet of that chip would give you a good idea of the capability...

The board psychofish linked to is called Bumble-B and should be available for sale soon. At Fletchtronics we're making another similar board that is better tuned for making arcade equipment. It has more inputs via a Microchip IO port expander, and optional hardware debounce circuit on all IO...