Legit Reviews

The award-winning freeware firewall "Comodo Firewall Pro" has just released the final version 3 after a really long beta testing.
Check it out!

http://www.personalfirewall.comodo.com/

Comodo Firewall Pro will secure your system against internal attacks such as Trojan viruses, malicious software, and external attacks by hackers. With a user-friendly single click interface you can allow or block access to the Internet offering complete immunity to attacks and total protection of your personal information. Real time traffic monitoring enables you to react instantly to threats and identify bandwidth bottlenecks. Silent Security Technology means no needless alerts with out-of-the-box protection against hackers, Trojans and other unknown threats

is this firewall any good?

I'm looking for a good firewall that is good for gaming and isn't a resource hog.

Comodo is suppose to be one of the best free firewalls you can find. ZoneAlarm falls a bit behind. It isn't too ressource hog: about 20 mb.
It doesn't seem to lag my games either. You should definitely try it out.