Choppers & Tankball
How about a little Halo 3 news? Yeah, I thought so. Looks like people have figured out how to get into the custom game menu, which reveals a boatload of options. Adjustable gravity, powerups, speed, etc. People have also figured out how to actually play custom games, which seems to require having already joined a custom game – and it has spread like a virus.
Right when the beta launched there were modders poring over code and finding all sorts of weird stuff (that is by no means guaranteed to make it into the final game.) An upcoming issue of gamepro yields some images that appear to prove some of the modders’ finds true: customizable Spartans, a Brute vehicle.
UPDATE: Kotaku has instructions on how to get into custom games. Pretty elaborate.