"Sendmail" (the Bat book) by Bryan Costales with Eric Allman
"DNS and BIND" (the Cricket book) by Paul Albitz & Cricket Liu
"Programming Perl" (the Camel book) by Larry Wall, Tom Christiansen & Randal L. Schwartz
"TCP/IP Illustrated" (volumes 1, 2 and 3) by Gary R. Wright and W. Richard Stevens
"Halting the Hacker, a Practical Guide to Computer Security" by Donald L. Pipkin
"Firewalls and Internet Security, Repelling the Wily Hacker" by William R. Cheswick and Steven M. Bellovin
"Data Communications, Computer Networks and Open Systems" by Fred Halsall (UTwente CS course)
"Building Internet Firewalls" by D. Brent Chapman & Elizabeth D. Zwicky
"Distributed System" edited by Sape Mullender (UTwente CS course)
"Gödel, Escher, Bach: an Eternal Golden Braid" by Douglas Hofstadter
"The C Programming Language" by Brian W. Kernighan and Dennis M. Ritchie (the picture is of the Second Edition, but I have the First)
"Applied Cryptography" by Bruce Schneier (the disk is here)
"Cracking DES" by the Electronic Frontier Foundation (scanned version here)
"The design of the UNIX operating system" by Maurice J. Bach
"UNIX network programming" by W. Richard Stevens
"Code Breakers - The inside story of Bletchley park" edited by F. H. Hinsley and Alan Stripp
"Computer Networks" by Andrew S. Tanenbaum
"The Code Breakers - The comprehensive history of secret communication from ancient times to the Internet" by David Kahn
"Postscript Language Tutorial and Cookbook" (the Blue book) by Adobe Systems Incorporated
"Postscript Language Reference Manual" (the Red book) by Adobe Systems Incorporated (I have an earlier Edition than the one on the picture)
"Principles of Compiler Design" (the Green Dragon book) by Alfred V. Aho and Jeffrey D. Ullman (UTwente CS course)
"Compilers: Principles, Techniques, and Tools" (the Red Dragon book) by Alfred V. Aho, Ravi Sethi and Jeffrey D. Ullman
"Computer Organization and Programming, VAX-11" by Souhail El-Asfouri, Olin Johnson and Willis K. King
"VAX/VMS Internals and Data Structures" by Lawrence J. Kenah, Ruth E. Goldberg, Simon F. Bate
"Introduction to the PDP-11 and it's Assembly Language" by Thomas S. Frank (gift from Frank)
"Fundamentals of Operating Systems" by A. M. Lister (UTwente CS course)
"Operating Systems, Advanced Concepts" by Maekawa, Oldehoeft, Oldehoeft (UTwente CS course)
the complete rainbow series of "UNIX Programmer's Manual, Seventh Edition" by Bell Laboratories
some books about the Motorola 68k family, hardware and assembly programming
"The TEXbook" by Donald E. Knuth
"LaTEX, A Document Preparation System, User's Guide and Reference Manual" by Leslie Lamport
"Analysis and design of parallel algorithms based on partial order semantics for functional languages" by Duco H. Fijma
"The Use of Functional Programming in Software Development" by Stef Joosten
"Modern Operating Systems" by Andrew S. Tanenbaum
"Operating System Design: The XINU Approach, Vol. I" by Douglas Comer
"The Art of Computer Programming", Vol 1-3 by Donald Knuth
"The Design and Implementation of the 4.4 BSD Operating System" by Marshall Kirk McKusick, Keith Bostic, Michael J. Karels, John S. Quarterman
"Introduction to Functional Programming" by R. Bird and P. Wadler (UTwente CS course)
"Biochemistry" by Lubert Stryer (UTwente CT course)
"Physiology" by Robert A. Berne and Matthew N. Levy (UTwente CT course)
"Lions' Commentary on Unix: With Source Code" by John Lions
"A Quarter Century of Unix" by Peter H. Salus
"The Complete Book of Locks and Locksmithing" by Bill Phillips
"Secrets and Lies" by Bruce Schneier
"Military and Civilian Pyrotechnics" by Herbert Ellern
"Secrets of Lock Picking"
"Fireworks: The Art, Science, and Technique" by Takeo Shimizu
"Definitive Guide to Lego Mindstorms" by Dave Baum
"The Unofficial Guide to Lego Mindstorms" by Jonathan B. Knudsen
"The Hitchhiker Trilogy" by Douglas Adams
"Internet Routing Architectures" by Bassam Halabi, Danny McPherson
"Routing in the Internet" by Christian Huitema
"JavaScript" by David Flanagan
"The physics of Star Trek" by Lawrence Krauss and Stephen Hawking
"Hacking exposed"
"ISP Survival Guide: Strategies for Running a Competitive ISP" by Geoff Huston
"Metamagical Themas: Questing for the Essence of Mind and Pattern" by Douglas R. Hofstadter
"BGP" by Iljitsch van Beijnum
"The Cathedral & the Bazaar" by Eric S. Raymond
"Database Nation" by Simpson Garfinkel
"The Practice of Programming" by Brian W. Kernighan and Rob Pike
"De Snuffelstaat" by Buro Jansen en Janssen
"Surely You're Joking, Mr. Feynman. Adventures of a curious character." by Richard P. Feynman, Ralph Leighton, Edward Hutchings
"Six Easy Pieces" by Richard P. Feynman
"Six Not- So- Easy Pieces. Einstein's Relativity, Symmetry and Space- Time." by Richard P. Feynman, Robert B. Leighton, Matthew Sands
"The First Computers: History and Architectures (History of Computing)" by Raul Rojas, Ulf Hashagen
"Honeypots. Tracking Hackers." by Lance Spitzner
"Practical Cryptography." by Niels Ferguson
"Programming Python. Solutions for Python Programmers." by Mark Lutz
"Learning Python." by Mark Lutz and David Ascher
"The Design of Rijndael. The Wide Trail Strategy (Information Security and Cryptography)" by Joan Daemen, Vincent Rijmen
"Building Secure Software" by John Viega, Gary McGraw, Gary MacGraw
"Star Trek Cookbook" by Ethan Phillips, William J. Birnes
"Linked: The New Science of Networks" by Albert-Laszlo Barabasi
"CyberShock: Surviving Hackers, Phreakers, Identity Thieves, Internet Terrorists and Weapons of Mass Disruption" by Winn Schwartau
"Know Your Enemy." by the Honeynet Project
"The Mythical Man Month. Essays on Software Engineering." by Frederick P. Brooks
"The Art of Deception. Controlling the Human Element of Security." by Kevin D. Mitnick - I also have the real first chapter.
Thanks to Amazon for the images.