Security
NIST – http://csrc.nist.gov/publications/PubsSPs.html
SANS – http://www.sans.org/
ISECOM – http://www.isecom.org/
OWASP – http://www.owasp.org/index.php/Main_Page
Bruce Schneier - http://www.schneier.com/index.html
Remote Exploit – http://www.remote-exploit.org/
Wireless Defence – http://www.wirelessdefence.org/
TSTF – http://www.tstf.net/home.html
Sicurezza.html.it – http://sicurezza.html.it/
oneitsecurity – http://www.oneitsecurity.it/
Zone-H – http://www.zone-h.it/
Bouncy Castle – http://www.bouncycastle.org/
Secunia – http://secunia.com/
InfoSecurity – http://infosecurity.ning.com
Hackin9 – http://hakin9.org
@SystemGroup – http://www.atsystemgroup.org
Security and Hacking Documentation – http://www.orkspace.net/secdocs/
Minded Security – http://www.mindedsecurity.com
Cryptonet – http://www.cryptonet.it
Insecure.org – http://insecure.org
RobText – http://www.robtex.com
Develop
Java
http://developers.sun.com/
The CERT Sun Microsystems Secure Coding Standard for Java