I'm just wondering how many people here use firewalls? And if so which ones they would use. I imagine everyone in a business has one running at some level. But, do you think average users should have a firewall such as Zone Alarm (or whatever) installed on their computer?

Personally I don't think average users should bother with software firewalls. I usually tell people, if they really want a firewall to forego the software and buy a hardware router or something with one built in.

But for computer builders/techs, do you put one on outgoing computers or what?