At first glance the google ads are lost where they are I had to look to find them, why not put them at the top or split the catagories horizontally and place the ads there. As it was the first of the month yesterday I decided to change my adsense ads on half my sites to see what would happen if i took them from the margins and placed them in peoples faces...guess what?? today i earned 3 times as much as i've ever earned before and My CTR was 4 or 5 times what it usually is.
I see all your ad placements are far away from the user area. Say try place the half banner just below the search box and move the 120X600 to the right side - right under the date & time.