Spybot Search & Destroy beta 1.4
Spyware Blaster (helps stop Active X installs)
Microsoft Antispyware beta
Cookie Wall to manage cookies
Run thru the online scanners regularly:
That a few things besides. With all that I still caught a script attack that cratered my machine last week. You can't be too careful these days. The arseholes are twisted, but brilliant sob's.
"That's good enough..." usually isn't.