A Microsoft representative confirmed to IGN that every copy of Crackdown includes an invite to the Halo 3 beta. If you want in on the beta (and didn't earn an invite by other means), purchase a copy of Crackdown on February 20 and you'll be set. You can even purchase a copy on February 21 or even March 15 and still be in the clear. Oh, and you'll get a copy of Crackdown to boot. Sweet!
man, microsoft is really trying to sell this game. judging by this new, if its true, i think they have already succeeded.