Today I wondered why my earning have plummeted. I couldn't believe my eyes when I discovered the usual format of my 728X90 banner ads are all screwed up with 3 vertical textlinks across the entire banner as seen on this sample page. Is this permanent? Or?
I think it's just a test from adsense, if they found it pays better they might keep it. If not, then it would have been just another test like several we've seen come and go over the years.