Does your Pop-Under revenue outdo your 768s?
As much as I still hate pop-unders, as a IM I stick with them as I make money from 'em as I'm sure you are too. One reason I could never ditch them is because they do very well and compared to all the other variety of media formats, they always do the best. I know my results are totally dependant on visitor demographics, numbers and script placements, be interested to hear your stories though.
$ POPS GUIDE - YOUR FIRST CONVERSION GUARANTEED! $