I've gone the other way this week. I'm currently reading 'Mastering Linux Security and Hardening: Secure your Linux server and protect it from intruders, malware attacks, and other external threats'. Let me know how you find the book, I've eyed it on Amazon more than once.
I should read some more books on security in general. I know the basics but when it comes to sophisticated attacks I don't really have a clue about the best way to protect yourself.