Tic-Tac-Toe Playing LEGO NXT Robot, with video.

NXTasy.org, a LEGO Mindstorms NXT community. bNXT. The NXT Step.

Also: RobotC. Microsoft Robotics Studio. NXT Byte Code (NBC).

(As before, I don't own a NXT set, nor can I possibly justify the financial or time cost of owning one. But damn.)