I'd have to agree with boxorox on this one, in contrast to my primary post, banning xtags will not solve the problem. Someone could have an xtag 'iloveallpeopleworldpeaceismygoalletsallmakelove' and have an in game ID which says 'iblowupjewsinisrael'...
The ability as a server to boot people from your game would come in nice.
And boxorox, if we're talking about banning the people, not the xtags, what about something which monitors people's IP or DNS? So you can actually, instead of booting the xtag, boot the PC of that person... I know it's not flawless, but it is a step in (the right?) direction. It could also solve problems with people who hacked/cheat the game.. Although of course, that is a different discussion.
grt tiZ