My AT&T pre-order (premier) was sent at 7:22am EDT. It is still "Pending".
What I wanted from the get-go was a no-commitment version, which I knew Apple wasn't offering on their site unless you were ineligible for any type of upgrade. Well I was completely off contract. AT&T's site was down for me from 3:00-3:30 on Safari and IE. I was able to get all the way to the check-out screen in Chrome (starting with the basic page and selecting the no-commitment pricing) but then it choked up there. So I decided to order on-contract from the Apple Store. Both the Apple site and iPhone app were working, so I ordered the 5 and called it a night (for 2 more hours, at least) after I got my e-mail from Apple.
This morning, I figured I'd try AT&T again. It registered that I was ineligible for the upgrade pricing, so obviously the Apple eligibility check went through. AT&T's site was working fine, so I went in and sure enough, all it gave me was no-commitment pricing so I placed a pre-order and got the "as soon as 9/21" message.
Since my Apple order is definitely arriving the 21st, my main concern is getting the AT&T order before the return period ends on my Apple order (9/21 or even the following week would be a bonus). Ideally, I'd activate the one from Apple on Friday to get the SIM card working, and then when the full price version shows up from AT&T I'd submit its IMEI for an unlock, swap the sim card, and then return the Apple version so I go back off contract. We'll see what happens.