Intrusion detection focus area; designed to assist discussion on security related topics, and provides a comprehensive database of security knowledge and resources. It also hosts the BUGTRAQ mailing list. http://www.securityfocus.com/ids
Operated by the SANS Institute, the ISC provides a user-supported infrastructure for intrusion detection systems to share information about ongoing attacks that span countries, networks, and administrative boundaries. http://isc.incidents.org
Distributed Intrusion Detection System. Submit your own firewall log excerpts or browse through current activity reported to the system. Features a list of the "most wanted" abusive IP addresses. http://www.dshield.org/
Extends the capabilities of conventional security systems to help manage threats more efficiently and effectively. Includes a wide array of intrusion detection and analysis tools for Windows servers. http://www.privacyware.com
An excellent source of IDS-related information, including security best practices, audit procedures, penetration testing, community information and more. http://www.Linux-Sec.net/IDS/
Collection of detailed technical papers on focusing on TCP networks, Intrusion Detection Systems, firewall protection and more. http://www.seclib.com/seclib/
Provides books, articles, software and other information on penetration testing and other security issues. Geared toward Windows NT/2000/XP Network Administrators. http://is-it-true.org/pt/