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I was just researching a US agricultural vortal and a banner with a very hip-hop design for "Dr Jay's Urban Clothing" came up. I wouldn't be surprised if the webmaster hears from his regular users about that one. Hehehe! Still makes me chuckle to think about it.
I did happen to see casino banners on an Ag site and wondered about it. As a travel & relocation site publisher, the only complaint about banners I've received to date was related to online gambling. Of course, I had just about every "offensive" ad server category blocked already.