The Boarduino is an Arduino work-alike kit from Adafruit.com that’s smaller, cheaper, and you can build it yourself.
The Boarduino’s small footprint made me want to see how small of a device I could whip up in an hour from some fairly complex components. So I decided to see how small the combination of a Boarduino, a Wii Nunchuck, and a hobby servo motor could be. Here’s a little video of the result.