Applies to any platform not just Xbox Live (thought I'd make that clear this time ) Too many for a poll and I guess that D/L content games should also be included. Well the popular choice will probably be Rainbow 6 (Xbox) but for me the one online game that had me really hooked was- Return to Castle Wolfenstein Never been so involved in any online game before as this. Ok so graphically not stunning but the gameplay was superb, taking team play to another level - all totally reliant on one another leading to some very tense, tactical and enjoyable games. Coupled with some well designed maps, weapons and game modes and all most all from your XBL friends list playing, it was superb. Certainly will never forget the clan games we had either. Shame though that such a superb game was ruined in the end by glitches and cheats Fingers crossed for a sequel So any other takers?