BlogFish
   Weblog by Jonathan Weiss about Unix, BSD, security, Programming in Ruby, Ruby on Rails and Agile Development.
   http://blog.innerewut.de

Computer Security
   How to secure your Unix computer system (emphasis on HP-UX).
   http://www.unixtools.com/security.html

OpenBSD release errata
   the OpenBSD CD errata page
   http://www.openbsd.org/errata.html

Secure your Digital UNIX (Tru64) Alpha
   Notes for securing a DEC/Compaq Alpha running Tru64 UNIX.
   http://www.maths.usyd.edu.au:8000/u/psz/securedu.html

SysAdmin & Security Resource Center
   Security, networking and UNIX resources for system administrators.
   http://www.syslog.org

Unix System Security Tools
   An introduction to Unix security tools, including Ten General Security Rules.
   http://www.albion.com/security/usst/

Unix and Security Services and Solutions
   Providing administration, installation, integration and consulting services for Unix and Security products and solutions.
   http://www.proxysystems.com