I've had no luck downloading the preordered album...but i did just get an email from apple, but it only stated the obvious solutions to starting the preordered download but did not address the fact that when we try to download we get the "purchase not currently available message"...
Here's the email:
Thank you for using iTunes. My name is Jason and I am sorry you have been unable
to access your pre-ordered item. I can confirm that your pre-order was processed
and it shows as being unfulfilled.
Let's try following these steps I have provided below.
To download your purchase, open the notification email you received from the
iTunes Store and click the link. iTunes will open and prompt you to check for
available preorders in your account waiting to be downloaded. Sign in, click the
Check button, and proceed with the purchase. If you prefer to download the album
later, click Not Now.
If you can't find the notification email, be sure to check the email address
that is associated with your iTunes Store account. Also check to see if your
email client or Internet service provider (ISP) blocked or filtered the email as
spam or junk mail.
If you didn't receive the notification email, follow these steps to download the
preordered album:
1) Make sure you're using the latest version of iTunes. It can be downloaded
free of charge from the Apple website at:
http://www.apple.com/itunes/download
Note: Installing the latest version of iTunes will not affect your library or
any items in your account that you haven't downloaded.
2) Open iTunes.
3) From the pull-down Store menu at the top, select Check for Purchases (if
you're unable to upgrade and are using iTunes 6 or earlier, you'll find this
option in the Advanced menu). If you can't find this option, you can also click
this link to Check for Purchases:
https://phobos.apple.com/WebObjects/MZFinance.woa/wa/checkForPurchases
iTunes will see that the album you preordered is available. You can proceed with
the download of your preordered album or click Not Now and download it later.
iTunes will also download any items waiting in your account.
If you no longer want this preordered album, you can cancel it and purchase the
regular version of the album (please be aware that some bonus material is
available only with the preordered version). To view or cancel a preorder,
follow these steps:
1) Open iTunes.
2) If you are already signed in to the iTunes Store, skip to step 4. From the
pull-down Store menu at the top, select Sign In.
3) Enter your account name and password then click Sign In.
4) From the pull-down Store menu at the top, select View My Account.
5) On your Apple Account Information page, click Manage Preorders.
6) On the Manage Preorders page, you will see a list of the items you preordered
and their expected release dates. Click the Cancel button next to the preorder
you wish to cancel. Click the Back to Account button, then click Done.
If you continue to experience an issue please reply back so that we can continue
to investigate this for you.
Sincerely,
Jason
iTunes Store Customer Support
http://www.apple.com/support/itunes/ww