I'm just gonna clear some stuff up, (also OMG Crypto is posting ) Jester, though he didn't release an aimbot (the only completely public mods arethe br aimbot and I think jump mods) This other guy called Super Modder (lol?) privately released it to a few people and jester was one of the people to test it. So basically now if you have a jtagged xbox, the right .xex and a keyvault you can mod in matchmaking. (Though not much is possible yet, just aimbot, ammo mods, jump mods, and a few other things. This one guy is working on making live modding like on a devkit possible online though) Very few people will have this online how ever and its unlikely Halo 3 will go crazy like Halo 2 did, and if it does it will take a while, more than likely after reach will come out. Halo 3 will never be the same as Halo 2 because no one can come up with the map signature. (Halo 2's was really easy) Long Story Short: A few L33t P30pl3 can mod in matchmaking now. Hope that clears some things up for you guys. Also this technically isn't an aimbot, its autoaim. There's a difference.
^I was contemplating NOT posting JUST because of your sig, but fokkit. Anyway, even if, this time, it wasn't Bungie, I'm still pretty sure at least one of them has done it before, just for the lulz.
video is up on youtube now quality is bad now but should improve when fully processed YouTube - aim bot footage for Zander1994
See... Guys like this piss me off... Spoiler I personally have a jtag'd xbox but I don't use it. After my old one broke and the warranty was long gone I found the jtag mod on a site and decided "Ah, what the hell..." But yeah, guys that think they're cool cause they can have the flaming helmet and aimbots are morons.
Okay this guy had like a super health mod enabled. I was playing him in matchmaking and shot him four times in the head which didnt kill, then once in the body and a melee. With a sniper After the game i talked to him and he modded it so that headshots were disabled for him only. Most bullshit mod ever.