nickreynolds - 8:22 pm on Dec 16, 2011 (gmt 0)
One of my sites experienced a 30% decrease in traffic at the time of Panda 2.1 (since then traffic has grasdually increased as different of my pages have slowly edged up to their previous positions.
The curious thing is that the drop in traffic was accompanied at exactly the same time in an increase in earnings (essentially an increased cpc). My guess is that maybe other sites showing adsense were more badly hit by Panda. So even if I'd gone down from position 3 to position 7 for a particular search term, maybe now I was the highest ranking site showing adsense - just a guess!