I think the hacking exposed series are wrote by different aurthors http://www.hackingexposed.com/about/about.html

Ive just finished reading Hacking Exposed 4 editon and found it very informative indeed.
I would recommend it to anyone intrested in the subject.

It is made to look like a book to provide sys admin's with a reference to securing their networks but when you have read it, it is very obvious it is for people who want to get involved in the hacking scene!!

It is a big time skiddie book though, but hey i cant exactly program my own port scanner or make my own version of netcat etc, so it was perfect for me!