Hi, I would like to know which books (if you have read/used any) would you recommend for each challenge section. It is easy to go to Amazon and search by titles, but I think it is more interesting to know which ones have you read and you would recommend.

I will start:

1.- JavaScript

JavaScript: The Definitive Guide
By David Flanagan
ISBN: 0596101996

2.- Exploit

3.- Crypto

4.- CrackIt

(Spanish)
Cracking sin secretos. Ataque y defensa de software.
By ZEMANEK, J.
ISBN: 8478976280

(Spanish)
Ensamblador para DOS, Linux y Windows
By CHARTE, FRANCISCO
ISBN: 8441514828

5.- Stegano

6.- Internet

7.- Programming

Thinking in Java
By Bruce Eckel
ISBN: 0131872486

(Spanish)
Algoritmos en C++
by R. Sedgewick

8.- Java

Thinking in Java
By Bruce Eckel
ISBN: 0131872486

Covert Java : Techniques for Decompiling, Patching, and Reverse Engineering
By Alex Kalinovsky
ISBN: 0672326388

9.- Logic

10.- Special

11.- Science

12.- Information Gathering

Regards,

Chemi.

Good call! I think The Codebook by Simon Singh might be a good introduction to the way of thinking in the category Crypto.

Well for Logic section there isn't any books that would help you.
It only needs your brain and be little adaptive.
Also you need a little bit of help of ours well known friend.
and that's all..

Grivier

Here you will find good advices/recommendations. Also for books.

http://www.caesum.com/handbook/contents.htm

I think the Holy Bible will help solve all challenges

lol

For Java I'd also recommend The Java Tutorial (very good for beginners) and http://www.amazon.com/gp/product/0471361747/103-4538723-1530236?v=glance&n=283155

Hopefully you don't forget my exploit tutorial and all the tutorials in the tutorial section.
http://www.bright-shadows.net/tutorials/wiw/tbs_1.2_wiw18112005.txt

tbs

Morpheus told us about http://www.caesum.com/handbook/contents.htm.
I just want to add that I asked Caesum to translate it in french (and he agreed).
So, for french talking people, the first web pages are available on :
http://commcomm.free.fr/Caesum/CHB Introduction FR.htm

quangntenemy, if you liked Java Pitfalls one... you will find interesting also:

Java(TM) Puzzlers : Traps, Pitfalls, and Corner Cases
by Joshua Bloch, Neal Gafter
ISBN: 032133678X

Hardcore Java
by Robert Simmons
ISBN: 0596005687

Best regards,

Chemi.