Sparkfun - How To Use a Multimeter
Ken Rinaldo’s List of Artists, Scientist, Researchers, Inventors, Organizations, festivals, Exhibitions, conceptual and technical reading sources.
Arduino Cheat sheet
Arduino In a Nutshell
Intro to Arduino Book - Excellent for people who like a more methodical approach and are just starting to code.
Sparkfun - Processing and Max/MSP
Sparkfun - Installing an Arduino Library
Sparkfun - Arduino Shields
Sparkfun - Arduino Comparison Guide
Multitasking And Arduino
ADD - Youtube thing
ADD - Gears animation