matbennett - 12:32 pm on Nov 4, 2013 (gmt 0)
I've definitely seen a big improvement from doing this on some forums. It's definitely where the users eye-line is and CTR seems to reflect that.
Careful not to cross the line in to confusing people in to clicking though - it's pretty easy with that sort of placement.
I have had some forum users really object when it is introduced though. Some just don't like the ad appearing within "their post".