A DigitalPoint Forums thread reports that Google is once again testing a new AdSense format. Here is a screen capture taken from a DigitalPoint Forum ad.
You can see the bottom right corner that has the "Ads By Google" is styled differently than a normal ad.
This is not the first time Google has played with that area. Here is a rundown of how Google has tested the Ads by Google location in the past.
In March 2004 we had AdSense Ads With Graphics that looked like:
In September 2004 we had Ads by Goooooooooooogle come out, it changed from the normal "Ads by Google" and looked like this.
Several times we had Google experiment with holiday themes.
In December 2006 Google Trying Google Logo on AdSense Ads that looked like this.
and an other like this.
Anyone getting tired of these tests?
Forum discussion at DigitalPoint Forums.