The Arduino Esplora is available from today for €44.90 + taxes for the Retail version and €41.90 for the non retail version. Source: Arduino ...

New Arduino Esplora Provides A Ready-For-Gaming, Customizable, Open Source Video Game Controller Darrell Etherington 5:59 AM PST · December 10, 2012 ...

[Tobie Nortje] sure remembers them and has built an Arduino controller to play virtual versions of the games. He started off by finding a website that is digitizing the old games.

The RoboTouch uses an old NES controller together with a Arduino board that is used to control micro servos connected to custom conductive arms. As you press the controls on the NES control pad ...

Electronics maker Adafruit Industries has developed its own Arduino-compatible boards, including one called the Flora--and a few craft projects to go with them.

At just $60 total (not including the Wii Fit), the project is also relatively inexpensive, and it seems that it's a fairly simple process to swap out the Wii Fit for the controller of your choice.