We gave Early Feedback on Google AdSense Click Area Change where we showed some people calling out that they saw a huge drop in earnings and their click through rate. We also reported some people saying they saw no drop in anything.
My statistics seem to show the status quo for now, but it still may be too early to tell.
Gabs reported an increase in CTR by 0.5% for a forum that has over 1,000 impressions per day.
Reviewing the WebmasterWorld thread that we have been tracking shows most people have not seen a significant drop in CTR, while some have. But most are fairly happy and some are even happy to see their CTR increase.
I figure I do a simple poll for this as well. So, AdSense Publisher, please take a quick look at your AdSense stats over the past several days and let me know if you see a change in CTR:
Forum discussion at Search Engine Roundtable Forums and WebmasterWorld.
