well, ive browsed the boards for about a week now and this will be my 1st post. soon i shall have a 60GB rio!
anyways, i've tried all the ones mentioned in this thread except for popupcop but it sounds cool.
i've been using what i think is the best: ZeroPopup. it runs whenever IE is launched and kills ALL popups. close IE and it closes too. if you see that you're on a site that clearly uses popups to navigate, just press F10 and it gets disabled. then use the same key to re-enable it. it also displays a tray icon to select options and such. it now has a better 2.0 version but its not supposed to be free