"Breadboardable" Arduino Variant

This single sided Arduino variant can be easily etched by hand and is part of the Playing With Electronics chapter of my new book "[The Makerspace Workbench](http://shop.oreilly.com/product/0636920028147.do)" from Maker Media! Simply open up the files in EAGLE 6.0 or later, print out the traces onto bare circuit board and etch away!