Before starting, I am finding this very hard to believe. A fairly active member at DigitalPoint Forums, posted a thread linking to his blog, where he has a screen capture of Google AdSense showing up in place of the ad spots of AOL's Instant Messenger software.
Here is his screen capture from his blog:
I was going to dismiss this post completely, but then I looked at the members history at the forum. He has over 700 posts at the forum and has been an active member since February 2007. So it seems like this member has some history.
I am still very skeptical that this image was not 'photoshoped' to look this way.
So I will leave it at being extremely skeptical if this is a true screen capture or something that was made up. I simply do not know.
Forum discussion at DigitalPoint Forums.