HuskyPup - 7:19 pm on Apr 14, 2011 (gmt 0)
I feel you guys are barking up the wrong tree, I've gained about 33% in traffic and I have:
Dark background colors + ads above fold
My ads on all pages are:
1 x 728 banner
1 x 728 adlink
Some pages have:
1 off 336 x 280 at the end of each article or image page below the fold.
My hugely popular Coppermine galleries use a 728 banner at the top and the bottom of each page.