US Government Information Security - DOD, Navy, and other government bodies' information security documents.
DHC - A Hacking Group with some helpful philes in its archives.
DarkhanD Communications - The UK's leading technical support site.
UNIX / Net / Hack - Unix and internet lore, technical docs and programming tutorials.
Hacking Texts - Small archive of some common introductory texts.
The Archives - Intended as a support site for hackers, this currently contains link lists for programs and text files.
Chris' DQC Archives - Various files on conspiracy theory etc.
Starting Point > Hacking & Security - Security, hacking, cracking and more. How to, and how to avoid it on your systems, for beginning and advanced computer users. No warez or serials, only pure information, tools, FAQs, libraries and so on.
Hackistry - A reference of Windows registry entry keys.
Anarchist CookBook - A site dedicated to informing the little minions on how to hack.
Hackers Hideout Library - An archive of hacking-related texts.
Wietse's Tools and Papers - Various computer security related papers.
Fatals Realm - Hacking, cracking, phreaking, humor, and informational texts. A place to start for newbies.
Higher Learning - This page is meant for all the hackers who still believe in the old hacker code, and contains texts concerning the arts of hacking, phreaking and demo coding.
Sailorman - Introductory articles about hacking.
Beginner's Guide To Lock Picking - A step by step guide to learning lock picking for common domestic locks.
Sla_123 - Download some research papers that are prety good. You can add your research papers by sending them via email.
PhoneTap - Texts on security.
Internet information computers - Legal but underground information about windows OS and the internet
The Security Writers Guild - A guide to computer security and hacking. Articles, ebooks, forums, computer humor, and hacking FAQ.
Pixel Format - Archives of texts about computers and security.