OK, it is (at least) weird that this book has not been reviewed yet...
This book tries to cover every aspect of IS and exploits and it manages to do quite a good job. Of course it is not oriented to a particular technology as it touches many different topics such as Windows, Unix, Web Application hacking as well as hacking tools.
What most people like in this book is the way every possible attack is approached and the structure it is presented through (Threat Evaluation, Attack Explanation, Mitigation/Countermeasures). This is an excellent entry point for somebody needing to gain an overall picture of possible threats, well known attack vectors and corresponding countermeasures.