Since early in 2002, we have been using an ad network called Tribal Fusion that serves banner and popup ads to our web site. And since 2002, I have hated these popup ads. Dave would regularly bother me to kill the popup ads, but we just could not afford to do it. Advertisers are willing to pay a significant premium for pop up ads, and at times they have been a significant portion of our revenues. Although XP Service Pack 2 initially provided a respite to users with its built-in popup blocker, nearly all the ad networks have found ways around popup blockers, which makes the popups even more annoying.