firewall: Sygate is available for download from cnet.com--easy to use, but no longer updated.

some new free security stuff:
SiteAdvisor-- tells you whether any given site is safe with regard to links, downloads, spam, etc. It runs as an addon to the browser.

DropMyRights--allows you to drop the admin rights (you need XP) to any program, such as your browser, even if you are running as the admin. This walls off the browser from doing any harm to your system if it does pick up a virus. I like the concept, but do find the instructions a bit too hard to follow.

VMWare Player andBrowser appliance--installs a separate browser into a virtual system which makes your browsing extremely safe. It is highly demanding of system resources--consumes tons of memory--so you need a high level system.

Shazou--firefox extension that provides a bit of extra antiphishing safety.
WOT does the same.

The question is not, Can they reason? nor, Can they talk? but, Can they suffer?
~Jeremy Bentham