I dunno, I just switched from adbrite to adsense today and got 24 clicks for 3,644 impressions. ($2.35) Are the ads in ok places? http://nogamesallowed.com
Ad is okay, however change the colors... the url should be white so it blends in (you don't want this to stand out) and then make the link color yellow instead (what you want to stick out)
8everything is giving you good advise, but I can see you have not yet implementetd her advise. (I myself wrote www.Adsensedecoded.com) Consider adding a second horizontal leader board unit at the botton above you final links. And maybe a vertical link unit above your right hand positioned navigational colums.