Security

Information Castle Cops -- a security site Counter Exploitation CEXX Ad Aware Software Engineering Institute CERT Drizzle Wireless Glock Soft -- network and security products Internet Crime Complaint Center Spam Abuse Spyware Information Virus Myths The IT Underground - Astalavista U.S. Computer Emergency Response Team Antivirus Kapersky McAfee Panda Symantec Free Antivirus GriSoft

Spyware
LavaSoft
SpyBot
HijackThis!
NoAdware
Spyware Nuker
PAL Spyware Remover

Firewalls
Agnitum
Kerio
Symantec
Zone Alarm
XP Firewall - not recommended.