Here are some of my recommendations:

1. Hacking: The Next Generation (Animal Guide) - http://www.amazon.com/Hacking-Next-Generation-Animal-Guide/d...

2. Discrete Mathematics for Computer Scientists - http://www.amazon.com/Discrete-Mathematics-Computer-Science-...

3. Imagine: How Creativity Works - http://www.amazon.com/Imagine-Creativity-Works-Jonah-Lehrer/...

4. The Information Diet: A Case for Conscious Consumption -http://www.amazon.com/Information-Diet-Case-Conscious-Consum...

Not exactly, but these two are slightly related:

Hacking Exposed: Web Applications, 3rd Edition - approaches the subject from a wider angle, not just about appsec.

http://www.amazon.com/HACKING-EXPOSED-WEB-APPLICATIONS-3rd/d...

Hacking: The Next Generation - more about what you can do with lots of web app flaws.

http://www.amazon.com/Hacking-Next-Generation-Animal-Guide/d...