I was asked by Packt Publishing to give the book Mastering Zabbix a review. It's by Andrea Dalle Vacche and Stefano Kewan Lee, copyright 2013.
I found it most interesting to see what topics they covered as the book title states, "Mastering Zabbix" vs. not covered. Many things I've done with Zabbix are not discussed in the book and many things I haven't done with Zabbix are discussed in the book.
I would say the book is a good resource for anyone who has installed Zabbix and has done some basic things with it. Now that they got their feet wet and are looking to get more out of the software, get the book!
The book covers some very advanced scenarios which I'm not sure should be in the book, but they are. One of which is High Availability. HA in Linux can be done different ways. I've done it, it's not easy. If you haven't done HA in Linux, then the book will probably shorten the learning curve, but it's not a cookie cutter system. You'll end up reading a lot of other docs/books on HA before you're done.
Overall, it's a useful book. It's not perfectly written and easy to follow in some places, but since you probably already have your feet wet, it's not bad. Definitely worth the online price. I would have bought it if there was a book when I started with Zabbix!