The ISBN, as I'm sure you're all aware, is a unique code that every single published book in the world gets. It's used to track and archive books, for the barcodes that the shopgirl uses to scan your purchases in, and for databases that log information about books.
Anyway, your ISBN is allocated to you randomly by various agencies. You get a book, and you fill it in and send the details back to them.
So we just entered Steven Savile's Malory's Knights of Albion: The Black Chalice into our ISBN list, and Ben pointed out the ISBN we just gave it:
Not bad for a book about the Devil's Bible and the anti-grail.