I will add to the LTR12101b the Etrust v.7 "Promo Edition" which was issued last August and can still be found on the net. It's pretty basic, not even email integration, but fast and articulate.
My preference is though Avast! 4 Home Edition- not too crippled compared to the pro one (missing the advanced user interface and script blocker), but it is free, it does work great, updates everything silently and very fast, and when accessing dirctories with lots of files or scans within compressed executables, it is very difficult to beat. Might have stability problems with a couple of apllication rules-based firewalls, but other than that I don't know any other shortcoming- plus that their support forum is simply superb.