I have selected the winners and will be sending out emails within the next hour with the voucher code (where you must then register online). There were a lot of responses and naturally I could only chose a few of you, so don't feel bad if you don't get chosen.
If you didn't win you can still go to GameSpot/EB Games and pre-order the game. Of if they are out of vouchers then try one of your friends or someone on a message board. Remember, each beta code can be shared with two other people. And if all else fails, and you're in North America, buy the first episode of Qore on the PSN which will give you access to the beta on Sept 8th. Sure its a week late, but it's better then nothing.
Anyways, I'm emailing the winners now. Thank you everyone for the replies, and congrats to those who won!