In GoW, everyone who hosts games is infamous with the shotgun....
At any rate we have a thread already with gamertags in it, so I don't think we need this thread. You can use the gamertags and Xbox 360 itself to get ahold of people, and if you set them as preferred players you'll find that it often will match you up with them in quick matches, plus you can send invites during any point of any game with the dashboard.