Support for the Arduino Yun has been released into the wild! This member of the Arduino family is a Single Board Computer with a built-in microcontroller that runs Linux. The real fun comes in making it run Node.js + Cylon.js to then communicate with the Arduino side of things.
Learn how to get started with the Arduino Yun in the post Cylon.js Fun With The Arduino Yun on the Cylon.js site. These instructions will help you setup the Yun to run Cylon.js and communicate with the Arduino, all from the convenience of the same board.