Sort of off topic, but just wanted to post this for Dragon (and any other *nix users), when you do decide to give Linux another go, have a look at Bastille -
www.bastille-linux.org [bastille-linux.org].
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Originally Posted by bastille-linux.org
What is it?
The Bastille Hardening program "locks down" an operating system, proactively configuring the system for increased security and decreasing its susceptibility to compromise. Bastille can also assess a system's current state of hardening, granularly reporting on each of the security settings with which it works.
Bastille currently supports the Red Hat (Fedora Core, Enterprise, and Numbered/Classic), SUSE, Debian, Gentoo, and Mandrake distributions, along with HP-UX. Full Mac OS X is in beta, ready for download today. Bastille's focuses on letting the system's user/administrator choose exactly how to harden the operating system. In its default hardening mode, it interactively asks the user questions, explains the topics of those questions, and builds a policy based on the user's answers. It then applies the policy to the system. In its assessment mode, it builds a report intended to teach the user about available security settings as well as inform the user as to which settings have been tightened.
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As for the original topic, I think others have already posted what I was going to say... except maybe considering Outpost Firewall. There's a free version which has received very good reviews, although it isn't the most easiest/user-friendly to configure but once it's running it's supposedly very effective. More info...
http://www.agnitum.com/products/outpostfree/index.php [agnitum.com]