= Shields =
 * [http://www.ladyada.net/make/pshield/ Protoshield] - Creating your own hardware. 
   * [http://www.critterandguitari.com/home/store/arduino-piano.php Pocket
 Piano] - Musical Instrument
 * [http://www.ladyada.net/make/mshield/ Motorshield] - Make things [http://www.ladyada.net/make/mshield/ move]. 
 * [http://www.watterott.net/projects/arduino-s65 LCD Shield] -  132 x 176 Pixel using the  [http://www.watterott.net/arduino/s65-shield_v002.zip LCD lib]. 
 * [http://arduino.cc/en/Guide/ArduinoEthernetShield Ethernet Shield] - connect to the internet using the [http://arduino.cc/en/Reference/Ethernet Ethernet library]. 
 * [http://arduino.cc/en/Guide/ArduinoXbeeShield XBee Shield] - can be controlled from an PC with [http://funnel.cc/ Funnel IO] or [http://www.ladyada.net/make/xbee/arduino.html XBee radios]. 
 * [http://www.atomicsalad.com/archive/2007/03/11/tutorial_sparkfun_protoshield_assembly_use.php Protoshield] - build it! [http://www.critterandguitari.com/home/store/arduino-piano.php Pocket Piano] - Musical Instrument