A hacker is someone who subverts the security on a computer, breaking into someone else's computer system. While other uses of the word "hacking" are not related to computer security, this category lists sites relating to hacking into computer systems.
Regular Websites
A hacking organization that provides a collection of websites with scandalous and amusing content. If you are easily offended by sexual or violent themes, you may wish to avoid this website. - Cult of the Dead Cow
http://www.cultdeadcow.com/
Defcon is the world's largest underground hacking convention. If you enjoy testing and trying to defeat computer security systems, then this is an event for you. You can also access the archives of previous Defcon events here. You can also discuss hacking with others on the forums here. - Defcon
http://www.defcon.org