Arduino is a open source hobbyist micro-controller used to make just about any device you can think of.
"It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments." - Arduino
Photo Credit: Arduino
So, I did some looking around and found interesting projects by people who used the arduino to build a robot.
From instructables:
Arduino Controlled Servo Robot (SERB) - oomlout
Ard-e: The robot with an Arduino as a brain - imadami
There are tons of projects out there that don't involve robots but are still very interesting to look at.
Build a 1/20 cubic inch robot with a gripper that can pick up and move small objects. It is controlled by a Picaxe microcontroller. At this point in time, I believe this may be the world's smallest wheeled robot with a gripper. That will no doubt change, tomorrow or next week, when someone builds so... 


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