General

• CERT Advisories
• SANS Top 20 Vulnerabilities
• Security Alert Consensus (Archive)
• US-CERT
• NIST's Vulnerability & Threats Portal
• US Department of Energy CIAC
• MITRE Common Vulnerabilities and Exposures
• Internet Storm Center

Operating Systems

• Microsoft's TechNet
• Linux Advisories
• SGI Advisories
• O'Reilly's Unix & Open Source Exploits

Applications

• Oracle Security Alerts
• Novell Security Alerts

Security Awareness

• Securing Your Web Browser
• Social Engineering and Phishing Attacks
• Identity Theft—Federal Trade Commission's resource
• Virginia Alliance for Secure Computing and Networking (VA SCAN) addresses Commonwealth's Information Technology Security Standard

Security News

• Cnet News.com
• InformationWeek
• SC Infosecurity News
• Security Focus (BugTraq)
• SecurityNewsPortal
• Virginia Information Technologies Agency
• WhiteHouse: Homeland Security News
• ZDNet TechUpdate