Linux

• linux.org
• Yves Younan's thesis ( postscript) on common programming security vulnerabilities and possible solutions.
• linux-admin-faq (also useful for any other unix variant),
• book on linux (4xx pages),
• linux network administrator,
• ibm on linux
• linuxfocus (electronic magazine)
• linux world
• linux magazine
• the linux journal
• the linux gazette
• lwn
• linux user
• unix review
• linux packages
• linux today
• tutorial (pdf, 660pp), see also here
• notes
• kernel stuff:
  • source (xref'ed)
  • kernel hacking HOWTO
  • course at cs.utexas.edu.
  • linux kernel 2.4 internals
  • kernel module programming guide
  • Rubini and Corbet, linux device drivers (2nd edition)
  • the DLP (linux documentation project)
  • info on the memory management subsystem.
  • more on mm
  • example drivers.
  • kernel links.
  • linux chicks :-)
• online books