NXTLog just released the next NXTLog building challenge. This time the challenge is to design and build a quadruped: a robot that walks on four feet. Once again, there's no limits to the sensors, motors, etc. that you can use, and judging is based on how innovative the design of the robot is, how well it works, and how well the robot is documented on NXTLog.You can read the announcement here.
-Jonathan