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, 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.
- A list of firewall vendors, white papers, resources, and FAQs.