I am playing a little bit with my theme to see if I can get a better click through rate for my Google Adsense banners. I put a leader board in the header to see how that works. I noticed that CNN had a leader board on their site. So maybe it is a good revenue earner. I think I will maybe a theme that sort of resembles the CNN page layout figuring they know what they are doing, and have experts that figure out how to get the most revenue out of their online real estate.