Android-controlled robotic arm using Arduino.
(1) OWI Robotic Arm (http://www.owirobots.com/cart/catalog/OWI-535-ROBOTIC-ARM-EDGE-KIT-87.html)
(2) Arduino
(3) Arduino Motor Shield (http://www.adafruit.com/index.php?main_page=product_info&cPath=17_21&products_id=81)
(4) Optional: Android device to use the Android app to control. Otherwise, you can use the Java GUI on a tethered computer.
Video of the arm in action: http://www.youtube.com/watch?v=wKaYWxAcVs8
http://rvmiller.com/2011/01/arduino-controlled-robotic-arm-with-android-interface/