Doug Moran and I built a LEGO MINDSTORMS model of the Mars Curiosity Rover for the Build the Future in Space event at NASA's Kennedy Space Center. The rover contains 1000's of LEGO Technic and MINDSTORMS bricks, and is 100% pure LEGO with no glue. Four of the six wheels are powered, and the rover can make 360 degree turns. The arm and mast are controlled via a separate NXT via bluetooth, and the rover is driven via a separate NXT Joystick designed by Philo Hurbain.
Special thanks to LEGO for providing all the plastic, and NASA for hosting a great event where we got to display the rover and build with the many families visiting the Kennedy Space Center!
Check out BattleBricks.com for more information about the rover and other LEGO MINDSTORMS projects.