Well done Rosso, excellent thread. Not much to add, except I would echo oatman's recommendation of SpywareGuard and SpywareBlaster (add links/references in the main post?) - I run these in conjunction with Zone Alarm, Avast and Ad-Aware. If nothing else, anybody who connects to the internet from a Windows PC - especially non-dialup users - should have an effective firewall: it really is essential.
BTW the site on the link for AV software comparison doesn't seem to have any such information - does anyone know of another?
Alex