Google Adsense TOS has been updated and things are getting a little tougher for Adsense publishers.
Competitive Ads and Services In order to prevent user confusion, we do not permit Google ads or search boxes to be published on websites that also contain other ads or services formatted to use the same layout and colors as the Google ads or search boxes on that site. Although you may sell ads directly on your site, it is your responsibility to ensure these ads cannot be confused with Google ads.
From where I’m sitting, it looks like Google is forcing publishers to choose between Adsense or YPN or MSN. Google knows they have a huge majority of the marketshare in this sector and that most of us will choose Google Adsense over the others.
