In this video, found here at mlgpro.com, 2 Halo players have developed a new technique that lets you jump off of most surfaces in the game... well I would not call it a technique so much as a physics glitch. But anyways, apparently its done by hitting a corner and crouching and uncrouching in a certain way... though I am not sure exactly how they do it. The makers of the video have not said anything about how they did it. Anyways, enjoy. Its pretty interesting to see what they can do.