Drive the Monster Milktruck (or Segway) with the Wii Fit Balance Board.
Video of app in use at SVI Hackathon: http://www.youtube.com/watch?v=Jnsxsn2CZFo
Wii Fit Balance Board -> Osculator -> this (node server.js)
Writeup: http://www.quora.com/Stormy-Shippy/Virtual-Segway-tours-with-a-Wii-Fit-balance-board
adapted from: