In 2009, I designed a NXT Tripod walker inspired to the War of the Worlds movie,
to be featured as a Bonus model on the official LEGO MINDSTORMS page.
Finally, I decided to publish it. The Tripod can walk in three directions, and it can turn within its own footprints in a unique way. I think this is the first LEGO tripod robot that can really walk. Instructions and program available for free on my website. Enjoy!