Arduino Basic Connections are a set of easy to read electronics diagrams for Arduino. They are circuit schematics with additional information for connecting various things to your Arduino. <br>
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<a href="http://www.pighixxx.com/abc-arduino-basic-connections">http://www.pighixxx.com/abc-arduino-basic-connections</a>/<br>
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They just started an indiegogo campaign to print a selection of the diagrams in physical book form. <br>
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<a href="http://www.indiegogo.com/projects/arduino-basic-connections-the-book">http://www.indiegogo.com/projects/arduino-basic-connections-the-book</a>