If you look closely..this gameblog http://www.Joystiq.com has 8 ads on ONE page. I thought you were only allowed "...up to three ad units per page (in addition to one link unit and one referral button per product)..."
Oh a premium publisher? Never heard of that, what is it? If you look closely they have a 468 x 60 text after every other entry...wish i had this luxury.
They're part of Weblogs, Inc. Network, which has a ton of major blogs on every subject imaginable (check below for their network blogs). So yes, they are most definitely a premium publisher, and they get to choose what they want to do before signing on the Adsense dotted line.
Glad I saw this thread I didnt realize there was a rule on the number of ads you can have. I see sites all the time that seem like they're nothing but google ads.
They are a mystical bunch. Everyone's heard of them, but no one has ever really known an actual premium publisher. (Aside from their website, I mean.)