This can be used with any console, I don't think it has to differ as much except for the PS2 under the game tab you can have a sub forum on upcoming games (Sony is still releasing games for the PS2. I'm not sure about the GameCube but I know Xbox will not have upcoming games). None of this has to be agreed on, but I figured I would throw something in to try and help. How about something like:

Xbox
-Games
--Game Reviews
--Game Cheats/hacks
--Upcoming games (PS2 ONLY)
--Current Games (PS2 ONLY)
--Misc./ open/general discussion
-Mods
--Hard Mods
--Soft Mods
-Help
--Game questions
--(I'm not really sure what problems the original xbox/gamecube/ps2 has if any, but you could have some sort of general discussion of problems that people could try to help with).
-Tutorials
--Game tutorials