My two cents.
The publisher wants you to think, in buying this title you'll have no need for nine other books to help you get the most out of Word 2007. That's cover puffery. There aren't any books out there on "Inserting Bits and Pieces" or "Word's Brave New World" or "Mailings."
Worse, Word 2007 for Dummies is an extremely poor substitute for Microsoft's online help and Word's developers blogs. Have you visited those sites recently? Talk about fast, authoritative 'get in, get out' solutions.
Finally, the Dummies trade dress; cheap paper; and lowbrow, patronizing tone is really tiresome. For comprehensive reference, there are much better books from Que and Microsoft.