About a year or so ago we were working pretty hard with our server admin to harden our servers against potential threats such as remote shell executions, bots, and xss vulnerabilities.  It was a frustrating time for me because there were a lot of elements that I couldn’t get my mind around, fortunately our server admin Matt is a hoss when it comes to Apache and that helped a whole lot.  To get myself up to speed on Apache a lot better I picked up this book and really learned a lot from it.  I recommend it to anyone who is thinking of getting their own server or who is tasked with managing a high end enterprise web server that runs apache.  It’s also a great reference tool that I sometimes refer back to from time to time.