I definitely prefer banners to Pop-ups...I was once on a website, and I can't even remember what the website was about, and literally 40+ pop-ups starting coming up on my screen. ahhhhhhhhhhh!!!!
ironically, there was a discussion on this very thing on cnn this morning. it seems only 2% of sits use pop-up ads! i think this is a little off. maybe they just looked at, say, 1000 sites or so. depending on what kinda sites they went to, they probably didn't see hardly any ads! but on tv, they showed him going to some news site or something that had about six windows pop up. then the idiot minimized them!