Drive Sentry. Freeware package which offers firewall protection using a slew of security features, including maintaining a local list of trusted programs and a malware blacklist. I haven’t had a chance to try it yet, but the story sounds good from here. I also like the fact that they’ve got a portable version which protects your USB drives from attack if you plug them in to someone else’s machine. Sounds very useful and definitely worth checking out if you’re in the market for some computer protection.