A new vidoc has been released for Halo 3 entitled "Cinema Paradiso." Check it out
Here This video is mindblowing. It shows the "save video" feature of Halo 3 multiplayer in which you can record a demo of the entire match.
After the game ends you can go back and watch things from your opponants point of view, or from any 3rd person angle you desire! This means there will be no way to get away with cheating ever. It also means you can analyse the strengths and weaknesses in your play or share the video online and have other people give you contructive advice. Ever die in a first person shooter and not understand what exactly happened or how it was possible? Now you have the chance to check out the replay in slow motion and see exactly where the sniper was camped or where the grenade came from.
The video also details the Forge system which allows players to completely customize the maps. Want to move the spawn point of the flag in capture the flag? Want to change weapon spawns or just make an entirely new custom map? All these things are available. I would not be suprised if some popular Counterstrike maps were ported into the Halo 3 engine, or even if some highly motivated gamer made some type of RPG with this system.