I thought it would really benefit everyone if we did some sort of mass poll to see which AdSense ad format pays the highest. That way you (and I) can get a general idea of which ad formats we should try out on our websites. To find the highest paying ad format, just divide your total earnings for a certain ad format (I'm assuming you have channel tracking turned on) by the total number of clicks and see which ad format has the highest average price per click. I'll start off by voting 336x280. Edit: I couldn't ad more options to the poll, so if you have a different ad format (link unit) which is your highest earner, please post below. Thanks!
well it depends on your theme and your site category but i think 728*90 works very well and also the rectangle 338*250 works very good