Really great idea. I checked out the ToC before ordering and I like the way it offers a comparison of the major existing version control systems and then includes in the comparison at the end the new version control system. So basically it's useful to anyone who is thinking about moving to a new VCS and "happens to mention" the author's VCS. I'd pay for that any day, but instead I'll just recommend the book to everybody I know... which is probably what they want...
