OT:
Microsoft has stepped up their game against modders like us, especially those who pirate their games. The only game that I'm sure still has any sort of 'hack' is Modern Warfare 2, as Infinity Ward has had some large internal changes, they've left it to die. At one time, there were hacks similar to that of an aimbot, but as of now, thats impossible.
If you want to have a step up against your enemies, then you might want to stick to hacking PC games, as hacking the xbox 360 is just a waste of time and a pain in the ass.