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.
http://www.dshield.org/

FirewallSupport.com
Online support service specifically focused on firewall security. Information and resources to troubleshoot firewall problems.
http://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.
http://sites.inka.de/lina/freefire-l/index.en.html