I've seen a few sites now with Yahoo ads that do not carry the "Ads By Yahoo" tag anywhere at all on the page. Kind of makes one wonder how this is accomplished. Do a 'view source', I find their code to be just as mine is.
Any ideas? Premium members maybe...special rules for special people, ala Google Adsesnse?
I have noticed that the Ads by Yahoo blends into the back ground of the ad block when certain colors are selected. I haven't configured any new ads in a while so I don't know if that was just a glitch from early beta and I don't know whether it has been fixed... it made ad blending real easy though :)
I have YPN ads with beige background to match my page background color. Yahoo! serves "Ads by Yahoo!" as white text, which is barely discernible on the beige background. In this situation, Adsense would default to some darker color to make the text stand out. If Yahoo! defaults to a lighter, unreadable default color, that's their problem, not mine.