+ 1!!!!!
Called Apple just now. No sign of my order made at 01:10 this morning. New order taken over the phone.
I urge anyone who has not had a confirmation email to call Apple as soon as!!!
I can confirm that there may be a need to call Apple, but don't base it on whether you've had a confirmation email yet. Go to your local Apple website (wherever you ordered from) and log in to your Account and check your orders. If you can't see your order at all in the list, call Apple.
If you can see your order, click on More Details and see if there's a clickable blue 'Edit' link next to your shipping address, email address and shipping email. If there is, you're golden. Just wait for your confirmation email - their systems are slow right now but it will get sent to you. If you can't click the links, your order is stuck and you should call Apple and ask them about the order.
I just called Apple and this is what I was told, as verbatim as I can remember.
"Basically we have two systems - one that generates the quote and the order number, and another that receives the order to our shipping department. What's happened with one of your two orders is that it's got stuck in the transfer process and is pretty much in limbo. I'm sending documents through to the shipping department for you now that will unfreeze the order and get it going, and you'll likely receive an email confirming your order in the next 24 hours."
He also confirmed that my place in the queue would not be affected by this glitch, as orders will be dealt with by Order Number, which was successfully generated when I placed the order in the first place.
I also asked him about the likelihood of my order being affected by late items like the case:
"I don't anticipate that being a problem. Normally we like to ship out single shipments but in this case as the iPad is due to be delivered by the 28th if there is something else holding it up we'll likely change the way we ship so the iPad gets there on time. But again that's something you can go into your account and sort out nearer the time if there's anything holding up the order."
Hope this helps!