So I guess AdSense Experiments have been around for a while, but since I use the old interface, I haven't really paid attention.
This morning they put a notification in my Dashboard suggesting a style change for one of my top ad units. Really front and center.
Now, I happen to think that the experiment they suggested (remove the background color and border) would cause that ad to be *too* blended, and might get me into trouble but I was feeling adventurous this morning, so I approved it. Google controls the delivery (which now that I think of it, will be weird because I'm already rotating different color ads in that space)
The last time they emailed me a specific suggestion, they turned out to be right and revenue jumped like within the hour. So I'm willing to give it a try.
We'll see what happens. I have a screen shot of their suggestion, just in case they do decide it's too blended and complain.
Have you tried the experiments yet?