I'm in need of the simplest firewall software out there, meaning I only need software which would allow me to tell it which application can access the internet (total upload/download blockage control) and which not at all. It should be small, simple, and hog as few system resources as possible. I'm aware of ZoneAlarm and Outpost, but those hog way too much resources and offer me countless features which I have no need for. Which one do you recommend? Oh, it should support (run on) Win2k3 too.