Well, googlebar is the only thing that kept me from a total crash because of some malicious submissions, so I rather like my popup killer (however, it doesnt seem to be spyware though, I've ran ad-aware after installing it and it didn't give me anything weird)
I'd recommand to take SpyBot Seach and Destroy and immumise your pc, can cause some trouble with certain websites though.
I don't like NG's pop-ups because I'm simply not interested in a free porn ezine or something like that. However, I think it's not much of an effort to click a banner a day. NG might not get paid per click, but it certainly does encurage companies to pay them for space.
Still, it would be a bit more encuraging for me to click banners if not all of them would involve hentai and other raw meat.