9 links
Attrition.org
attrition.org
Attrition is an eclectic collection of internet and computer security resources.
Crewl Underground Madness
blackhat.be
Belgian group specialized in computer and network (in)security, hacking, coding and phreaking.
Cult of the Dead Cow
cultdeadcow.com
Offers blog, team background, tools and BackOrifice downloads, and news archive.
Nomad Mobile Research Centre
nmrc.org
Hacker lab engaged in vulnerabilities research. Security papers, full disclosure advisories and current projects. Also features a FAQ on hacking techniques.