The IT Security website is an excellent resource for researching corporate security needs and best practices. The articles below describe options and best practices for corporate firewall implementations.

http://www.itsecurity.com/features/essential-guide-firewalls-061208/

QUOTE: Firewalls play a central role in IT security, standing between enterprise networks and the outside world to protect computers, applications and other resources from external attack.

Related Articles:

5 Firewall Tests and Supporting Tools

Firewall Comparison Guide

3 Tips For Deploying a Firewall

10 Tips to Make Sure Your Firewall is Really Secure