I believe you have already heard my opinions on pops, how and why we got them running on TS, fortunately though, the kind of minimized rotation we are giving them seems to be working perfectly among our readers which equal to zero complaints ;), good read if you are into net advertising:

ACCORDING TO A STUDY conducted by GartnerG2, 78 percent of respondents claimed they found pop-up ads "very annoying." In contrast, only 49 percent of participants applied the same rating to banner ads.

Yet pop-ups had click-through rates almost twice as high as those of banner ads, meaning they're probably going to stick around a while. Indeed, Nielsen/NetRatings' online-advertising rating, AdRelevance, found that pop-up impressions jumped from 1.2 billion to 4.9 billion between January 2002 and September 2002.