the euro release of the CoD4 beta for the 360 is on sept 10th. If you wanna get a token to be able to play you need to register on http://www.eurogamer.net/index.php
dont forget the confirm email.
After your registered go here http://gamers.eurogamer.net/giveaways.php?id=8
and you should get a screen asking for your xbox gametag.
I hope it works and you all get in. It has been an AWESOME beta so far.