I had a pop up ad tonight that wouldn't let me close it, even though it had a close button, or minimize it (it always stayed on top). I had to shut down and reboot to get rid of it. This is the first one I've seen like this in quite a while, even though I don't use any kind of commercial ad blockers. The only thing I have going is the free Google blocker (download the Google toolbar NOW, besides the ad blocker, the autofill also carries it's own weight) and it seems to be blocking up a storm! Hmmm, maybe I should see what kind of commercial stuff is out there anyway, although it's hard to beat something that's free :)