Bah.
NAV 2002 is fine for home use. Especially if you want to see the pop-up and tray icons that show you that it's scanning your e-mail. I much prefer an AV or firewall to stay relatively hidden. I don't need it to pop-up or come into the tray then go away when it scans e-mail. I know it scans e-mail, and I know when I get an e-mail in (or send one). Why do I need the extra notification?
Same theory applies to firewalls. ZA can be some fricking annoying with it's pop-ups saying that something is happening...
I run BID and Norton Corp, never had any problems, runs smooth as a babies bottom. No annoying flashing things, no annoying pop-ups, perfectly secure and stable system.
BlackICE (BID) now has application level filtering support (as of today, v3.5 was released with it). I haven't tried it yet, but if it's just as annoying as other programs, then I'll turn it off if possible.
One of the best things any user can do is educate yourself. That is your first line of defense...