Mine just went through too. Keep trying folks...
Not sure if it helps, but I signed in to my Apple account, placed a bumper and a dock in my cart, then kept hacking away at the "pre-order" button and re-typing my phone number etc. Finally pushed through about 10 mins ago.
I think it will still feel like some sort of cruel joke 'til I get that ever-elusive confirmation email...
Kind of interesting: receipt says phone delivers on June 24 with the free standard shipping, but the bumper will arrive anywhere between the 25th - 29th. I'd better avoid alcohol those days - that's what got me into this frantic mess in the first place. R.I.P. 3G haha