PopMyAds

This is another site I've wasted time running ads with on my blogs. All you or your visitors have to do is pull your scroll bar or click somewhere on your pages and there will be a blank pop layer that covers your entire site for several seconds - this despite the fact that this site is officially providing pop-under ads which pop up under the user's browser and generally don't lead to annoyance. Also, the earnings appear to be infinitesimal. If you run ads, frequently test your links and click away on your sites to make sure you're not getting bad ads that can ruin your online business.