Since some of us are crazy enough to have made the whole PS3 vs 360 setting into a conspiracy theory, gametrailers ended up writing an editorial responding to it.
Stupid really but thats what happens when fanboys get rabid sometimes...
http://gtshane.gametrailers.com/gamepad/index.php?action=viewblog&id=232557
This is prolly the key part:
"I guess the issue here is that PlayStation 3 fans believe that setting the RGB to full and adjusting the white levels--something that most PS3 owners will never even know exists--is the only way to make these comparisons fair. But where do we draw the line? Then do we go into the Xbox 360 settings and start screwing with stuff until we think it looks better? Who exactly decides what "looks better" means? One person likes dark blacks, another may like more detail and a lighter display. There's no other solution to this problem other than to do what we did, which is leave the consoles on their default settings and create as scientific an environment as possible--meaning making sure all variables that can be controlled are made the same."