sim64 - 8:39 pm on May 11, 2010 (gmt 0)
I'm seeing this on some 728 x 90 ads on my site.
Instead of the 3 horizontal ads that are normally shown, I am getting 3 (or 4) vertical ads.
It looks as though they are deliberatly set up to look like internal navigation links, probably be nice for our CTR but a bit unethical and I would almost say deceptive on googles part.
Hope this doesn't lead to anyone losing their AdSense account for not making AdSense ads clear.