Ray, are you absolutely sure there's no serial in your "order has been processed" e-mail? It shouldn't be sent separately, but included in it. If your e-mail is titled "Thank you for shopping with Stardock", the serial is included in it. For example, this is mine from the Sins preorder:
Products Ordered:
=----------------------------------------------------------------------------=
roduct Name : Sins of a Solar Empire (Digital Download Preorder)
User Name : xxxxx
Email : xxxxx
Serial Number : xxxxx
Or from Demigod:
Products Ordered:
=----------------------------------------------------------------------------=
Product Name : Demigod (Pre-Order) (Digital Download)
User Name : xxxxxx
Email : xxxxx
Serial Number : xxxxx