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.
FirewallSupport.com: Online support service specifically focused on firewall security. Information and resources to troubleshoot firewall problems.
The Freefire Project: Dedicated to Users, Admins and especially Developers of IT-Security Solutions (especially Firewalls) based on Free Software. It features a large Tool overview, some articles on IT-Security and Web Links to other resources.