Hey, I pre-ordered on July 26th and am still waiting for the "invite" email to use the first code received.

I followed these instructions:
Visit http://preorder.na.finalfantasyxiv.com and register. You will be notified via email prior to the launch of the game on when you can return and redeem your preorder code to unlock Early Access to the game along with instructions on how to receive your Cait Sith Doll minion and Moogle Cap digital content.

and have never gotten the notification email. I ordered PC version through SE/Digital River.