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Here is a Python library that I cooked up to replace Firmata/Pyduino, which I could not get working with my Diecimila. The library is based on the Simple Message System protocol, an Arduino library intended to facilitate simple i/o control between computer and microcontroller (it can be found here: http://www.arduino.cc/playground/Code/SimpleMessageSystem). My Python library is pretty self-explanatory (just make sure you have the SMS example sketch loaded on your Arduino)