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Hardware: Reference materials
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Arduino Hardware
ButtonShield – a shield built for the Arduino profile that has 26 buttons on it with mode selection.
ButtonPad – is used primarily with the Arduino Mega as a touch pad.
Ethernet_Shield – A shield that allows for Arduino that talks to Ethernet networks
ExtenderShield – A pin replicator that lets two shields attach to the Arduino at the same time
IlluminatoXMachina – Is a processor cell typically used in a network of cells
Illuminato::Genesis – Arduino compatible board with 42 digital I/O pins, and can accept shields made for the same layout as the Arduino family
InputShield – A joystick shield for the Arduino
Lithium_Backpack – a USB rechargeable lithium battery pack that snaps to the back of the Arduino
RelaySquid – Programmable relay controller for the Arduino
TankShield – tank tread shield that let’s the Arduino move around like a robot
TouchShield – OLED touchscreen shield
TriAngles – Vertical attachments for the ExtenderShield
WiNet – A wireless networking kit
XBee_Shield – XBee communication shield

Open Source Books
OpenSourceBook_1 Open Source Hardware Book Volume 1 Table of Contents
smarttypes: an open book about open hardware