Windows Security Event Log Resources

The following links describe every Windows Server Security Event log that exists:

Windows NT
KB174074 – Security Event Descriptions

Windows 2000
KB299475 – Windows 2000 Security Event Descriptions (Part 1 of 2)
KB301677 – Windows 2000 Security Event Descriptions (Part 2 of 2)

Windows 2003
Windows 2003 Security Guide, Chapter 4, Audit Policy

Windows Vista to Present
KB947226 – Description of security events in Windows Vista and in Windows Server 2008
Security audit events for Microsoft Windows Server 2008 and Microsoft Windows Vista

Additional Resources
Ultimate Windows Security
EventID.net
Security Log Encyclopedia