I couldn't get either the Apple.com website or AT&T website to work at 2AM (CST), so after about 5 minutes, I opened the Apple Store App on my iPad and was in business.
It wouldn't let me use express checkout (which I had setup on purpose earlier in the day just for this exercise), but I was able to check out fairly quickly, and was completely done by around 2:15 (15 minutes after pre-orders began).
My online order status shows as delivering by next Friday!
On a weird note, the Yahoo servers must have been getting killed last night as I couldn't get my damn email to refresh on my iPhone to verify my pre-order, so I went to the online site, and it was down.