Rating: 

The book (in a typical No Starch Press style) gives a clear, concise rundown about Nagios in general.
As such it is a well written and sound introduction to the Nagios topic.

After having read No Starch*s Nagios book you will know exactly how Nagios works inside.
The thorough explanations, flow charts and many tips and tricks leave no doubt that after you
finished the book you know your way around any Nagios installation.

What is remarkable is, that even though the Nagios topic is fairly young, the authors manage
to describe more than 70+ plugins. !!

One of the features of this book was for me basically a new level of "Usability" - or should I
say "reading quality" ? The text contains virtually "links" to related or refered to sections in
other chapters. That allows the reader to quickly jump back and forth to follow up on something.
A BIG time-saver and from my point of view much appreciated.

Beginners or junior system administrators will find No Starch's Nagios book an excellent choice.
It doesnt come with all the latest bells and whistles but it certainly covers more than 80% of
what the average joe sysadmin needs to know.