Hi All,
I got advised of this Free Firewall (although for a corporate solution it does cost some $'s), and at a glance, it seems pretty damn good.
http://www.smoothwall.org/
..it was designed to produce a hardened internet firewall device, turning a server, workstation or reduntant PC into a replacement for a hardware firewall router often costing several thousands of dollars.take this product and shove it under the noses of the security vendors charging huge amounts of money for providing lesser product.