Uncharted 2 beta

i put this in the uncharted 2 forum but i thought more people would see it here. but kotaku are giving away 300 codes in old posts heres one of the posts http://kotaku.com/263482/warhawk-beta-is-out
Best get in quick before there gone thought i'd give everyone the heads up.

Grr... tried loads, guessing they're all taken? :/