I would like to recommend a book to anyone interested in security, it's called Hack I.T.
-Security Through Penetration Testing. Published by Addison-Wesley and written byT.J Klevinsky, Scott Laliberte and Ajay Gupta with a forewaord by Simple Nomad.
I work in the book manufacturing industy so I have a chance to read books before they ever hit the stores and I found this book to be very informative and well written. The book also includes a CD ROM with penetration testing tools included. I don't know if this book is availabe in stores yet but it is well worth looking for.