First of all, i think this site should have optimized their adsense ads for better earnings... This is the best community site for adsense and yet i think their site does'nt serve a good example. 1.) I think their link units (below the first post) should be colored blue.... it attracts a lot of clicks since internet users expect links to be blue. 2.) They are still using that ad in the top corner... very bad. I think, like everyone else, they should put a leaderboard below the navigation links and blend it well. 3.) An adsense rectangle in the first post at the first topic is OWNAGE.
I think DP has himself idea, they don't like to has too many ads and highlight ads are around the forum cause too many webmaster wouldn't like to discussion in here