Did you notice many sites, like ezarticle have different Adsense format? Many are customized 1. How can we get that kind of ads? Where to apply? 2. Does these ads pay more? No negative effects, like smart-pricing? They have tons ads on one page
Yes adsense has been customized to their website needs.you can also see in times.I think they are premium providers.
Premium publishers get more options in layout and ad types and supposedly get their own account manager. If you are getting 20 million or so page views per month you can get those options too.