Discussion forums with tutorials, Hacking programs and miscellanious threads.

Discussion forum for topics surrounding the underground, technology and the like.

Discussion forum for Southern California security experts and hackers. [RSS]

One of the worlds longest established hacking forums, offering resources covering everything from cracking to phreaking.

Discussion forum about the insecurity of humans known as social engineering.

Security and Development Forum with a Security Basics Forum and Vuln-Dev.