Basics:

1. The C Programming Language
2. Structure and Interpretation of Computer Programs - H Abelson, G J Sussman,
3. The Unix Programming Environment
4. Introduction to Algorithms
5. The C++ Programming Language

Unix/Linux:

1. Advanced Programming in Unix Environment -By W Richard Stevens
2. Unix Network Programming Vol 1 (and Vol 2) -By W Richard Stevens
3. Design and Implementation of FreeBSD Operating system -By M K McKusick
4. Unix Internals - The new frontiers - Uresh Vahalia
5. Design of the Unix Operating System -By Maurice J. Bach
6. Linux Device Driver - 3rd Ed
7. Linux kernel developement - Robert Love
8. IA64 Linux
9. Linux TCP/IP stack
10. Solaris Internals - McDougall & Mauro
11. Unix System for Modern Architecture - Curt Schimmel

Windows:

1. Windows NT File System Internals - Rajeev Nagar
2. Programming The Microsoft Windows Driver Model - Second Ed -

Other books that you should have :

1. Computer Networks - By Andrew S Tanenbaum
2. Modern Operating Systems- By Andrew S Tanenbaum
3. Database System Concepts by - A Silberschatz,Henry F. Korth, S. Sudarshan
4. Java Concurrency in Practice - Brian Goetz
5. Concurrent Programming in Java : Design Principles and Patterns
6. The Algorithm design manual - Steven S. Skiena
7. Concrete Mathematics - By Donald E Knuth and others
8. The Art of Computer Programming - By Donald E Knuth

Some links :

1. http://jungla.dit.upm.es/~jmseyas/linux/kernel/hackers-docs.html