CommunityBuildrs

It's a pretty hokey name but is worth checking out. It is essentially an affiliate ad network that has an innovative way of displaying the ad. The illusion of a curled corner is created that when moused over will "peel" down to show the ad until mouse-out. It is less obtrusive than a pop-up/under but also more graphically interesting than text links. So far, reported conversions are stronger than for other graphical ad types. It also has the benefit of using less screen real estate unless moused over.