Firewalls

DShield - Distributed Intrusion Detection System collects firewall log excerpts from volunteers. The logs are aggregated and analyzed. Several reports are generated showing trends in attack sources and methods used.
www.dshield.org/

FirewallSupport.com - Online support service specifically focused on firewall security. Information and resources to troubleshoot firewall problems.
www.firewallsupport.com/

The Freefire Project - Dedicated to users, administrators and developers of IT security solutions (especially firewalls) based on free software. It features a large tool overview, some articles on IT security and links to other resources.
sites.inka.de/lina/freefire-l/index.en.html