Following up on a story earlier this week that indicated that a DVD drive firmware exploit hack might let users play unauthorized games is this video, that, well, shows that it's been done. At least, I think it shows that. It's not definite proof (surely this could be faked), but the hackers responsible are claiming it's legit.

It won't let you bypass region restrictions, nor has it been made available to the public, but it will allow certain Xbox 360's to play burned games.

Xbox360 DVD Firmware Hacked [Xbox Scene]
Xbox 360 Backdoor Discovered? [Kotaku]