Random draw doesn't sound bad but you have to consider people who have pre-selected groups and how they play their roles. Ex: Rifleman, Sniper, etc. etc.
Really, who wants a team full of snipers who don't communicate properly? (Mainly because they don't know each other).
Could have a team of 4v4 that way one TV is split into one whole team facing another...it'll even help resolve LAN hacking where the enemy is looking at the same TV as you (which eliminates the element of surprise along with the ghillie suit...).
So my idea would be like....
A nice sized regular TV, say 26"+
XBOX360's with 4 controllers each.
Teams of 4v4 (Classic Rifleman, Sniper, Support, and CQB combos).
It'd be nice, cheap, and efficient with dealing with lag and screen hacking!
Anyone else agree? 
You would have to AT LEAST have PCs and 360/ps3 for this to be a valid tourney or you are excluding a lot of people in either bracket. There are a lot of PC users (myself included) who think playing fps' on a console is a joke. And I would imagine the same amount of console users saying the same thing about PC.
For consoles there would have to be multiple tvs/consoles.
For PC they'd have to be back to back or on the other side of separators.
Team sizes depending on the platform.
If it was put together teams would HAVE to be established long before fanime. Regardless of being friends or not, a team or not people would have to register as 'lone gunmen' or as teams so brackets could be worked out and the loners could be put on a team to either practice with or so they weren't alone. Details to be worked out by whoever is running it.
There are also a lot of rules that have to be used/enforced. Like do you allow grenade launchers, perks, uav, choppers, airstrikes. Which mode to use. HC or normal?
Not to mention all the hardware needed. If you choose pc, do you allow people to bring their own? Do you contact a local cyber arcade and see if they want to host it? What about with 360/ps3? Do you ask that someone bring in their personal systems and allow a bunch of strangers to man handle their equipment with likely no reimbursement for it?
If you're going to do it, great. But get together with others and try to hammer out the logistics of it quickly or your going to have 7 guys wanting to kill each other on 3 different platforms and nowhere to do it.
Hey Chewie, I'm a PC user myself and been playing FPS since I can't remember how long ago (Doom, Castlevania, Duke Nukem, Shadow Warrior<- LOL) and I understand where you are coming from but with PC's it leaves too much room for error, you know what I mean? Someone can have a really great PC whereas someone else's uses their own not-so-great PC and it kinda leaves room for a disadvantage. Don't get me wrong though, it's a good idea but there is too much of a disadvantage. Not to mention the space it'll use (even though the room is probably huge).
Well, again, this is just an idea I am proposing this in hopes that someone would be kind enough to take upon the burden of running a tourny. Maybe if we hammered it all out, someone would help organize one. I'm willing to bring my consoles over (along with my PC if need be).
Regarding the rule sets,
I think(my own opinion) everything should be allowed, people should be able to make full use of what Call of Duty 4 has to offer. If they play good and manage to get airstrikes, good for them, the other team will just have to adapt and stay indoors and away from windows. As for mode, I think a normal team deathmatch would be nice; it's quick, sweet, and to the point. There can also be a Free For All deathmatch for people who are by themselves and decide to enter. It'll leave 1v1s and 4v4s. There could even be a 2v2 but i doubt the teams would want to share the same TV. Because of this, the consoles would probably have the greater favor in proposal compared to PCs whereas connection problems, graphical lag, and technical issues can kick in (not to mention there are probably hacks by now...)
Again, this is just an idea, a friendly proposal to anyone who is ,godwilling, nice enough to take the suggestion of a COD4 tourny.