The first 34 pages of the book are numbered with roman numerals, for the introduction, table of contents, and so on. The chapter 1 starts over on page 1. Add all of those up, plus any blanks at the end and you'll end up at the actual count of 768. Hope this helps.
Jim Minatel
Acquisitions Director
Wiley Technology Publishing
WROX Press
Blog:
http://wroxblog.typepad.com/
Wrox online library:
http://wrox.books24x7.com