One final suggestion for back covers. We see this on some (but not all) advance reading copies. At the bottom, near/beside the marketing campaign information, specifics on the book. These include:
Number of pages
Number of illustrations
URL of books' website
Contact information - name, phone, email of contact person
Finally, don't forget to add, if you can fit it in (and some of the 'Big Boys' put it in VERY tiny print), "Text is subject to change. Before quoting anything in this book, please verify with the publisher/against the final bound book." We've seen this blurb put on the back cover, front cover, and also inside, on the title page and even, occasionally, on the copyright page.
Next time, what should your front cover look like???