deadsea - 11:18 am on Nov 8, 2012 (gmt 0)

I lost 40% of my traffic on January 19th, and gained back about half of what had been lost on October 9th. In my case, the ad layout was not very different at all. I still have some ads above the fold (one or two depending on the page). My ads are in prominent positions (often to the left of the content where users see them first). The main (interactive javascript) content is above the fold in a brightly colored area to make it obvious to users.