I came across a site today with adsense that instead of a 250x250 square had 3 borderless 234x60 "Half Banners" stacked on top of each other. To me it looked extremely tacky with 3 "Ads by Google" beneath each banner. Why would they do this? Could it increase eCPM? Did they want to forego the 250x250 for a 234x180 for space issues? (the ad was in a 234px column but looked like it was designed that way specifically to accomidate blending the adsense ads - it could easily have been a 250px column and fit into the design) Any ideas? Am I thinking too much?