http://www.exploit-db.com/

http://www.0x50sec.org/

http://www.80sec.com
http://resources.infosecinstitute.com/hacking-a-wordpress-site/
http://www.securityfocus.com/
http://ethicalhacking.org.ua/
http://www.cert.org/
http://www.getmantra.com/
http://www.inessus.com/
http://www.hackerhighschool.org/lessons.html