I've been looking for a firewall for Windows XP Professional x64 Edition.
I really am only looking for a simple one that let's me control outgoing communication. I'm not too concerned about incoming as I have a router. I just want to know when an installed program wants to "call home".
I usually use Symantec Client Security which has a firewall but isn't compatible with x64. It does have an x64 compatible AntiVirus but no firewall.