http://www.2600.com
2. Hacker News Network
http://www.hackernews.com
3. Security-Informer
http://www.security-informer.com
4. HNC Network
http://www.hack-net.com
5. DEF CON
http://www.defcon.org
6. Rootshell
http://www.rootshell.com
7. eSecurityOnline.com
http://www.esecurityonline.com
8. Hackers.Com
http://www.hackers.com
9. CERT
http://www.cert.org
10. L0pht Heavy Industries
http://www.l0pht.com