We're building the robotic manipulator arm for the NCSU Terrestrial Robotics Club as they take on the University Rover Challenge.
Build our 3d printed and laser cut arm. It has pressure fit gears (http://www.thingiverse.com/thing:8077), skateboard bearings on every joint, low cost servos, custom controller board, and lots more.
Our project page has lots more information. https://sites.google.com/a/ncsu.edu/robot-manipulator-arm/
GitHub for the controller code: https://github.com/t413/sedRobotController