Two exciting robots based on Arduino have recently appeared: the RobotShop Robot Rover Development Platform and Oomlout’s Arduino Controlled Servo Robot (SERB). They’re both all-in-one kits and look like very capable machines. SERB has the advantage of being open-source, with PDF downloads for making your own chassis on a laser cutter or scroll saw (see the instructions on Instructables).

Happy robot-ing!