I am a real fan of StyleCop and FxCop for the last 4 years or so (see how many rules FxCop+StyleCop).
Up until now, I have been only build up my knowledge from my own experience and reading blogs.
The small size of this book allows a broader vision rapidly, and covers things that I never had the time to implement on real projects (such as VS Templates, or files headers).
I also finally understood why my Resharper did not work with my StyleCop, which was an easy thing to fix.
It is worth reading !