Popup Blocker Failings
For a while the Google Toolbar was enough for me to keep the popups at bay. Later I got a new PC at work running Windows XP with SP2 and it's popup blocker ended up catching more than Google’s (SP2's obviously has first crack at it)... so now and then one would make it through SP2's protection and Google's would stop it.
More and more lately though I've been seeing more and more popups from numerous sites. From the looks of it, most of them target IE and not Firefox as in limited side by side testing Firefox seems to be blocking a few more than the Google Toolbar and XPSP2 combined... quite odd.
I’m forced to wonder how many of those programmers building popups and other related code to bypass popup blocking are targeting FireFox and how that # will change as/if it's user base increases.