Well... I'm not saying it has to be right at the top of the front page or anything... and there is the choice between banner and box formats. I kinda see what griever means about a non-comic site though... Hmm... I think I may make it a "general requirement" with "specific exceptions." That is, if someone wants a domain and has a specific reason to object to the banner/box thing, than I'll hear them on an individual basis and consider it. I was already planning to do that with existing sites (hence the "selectively enforcing" phrase) and not just insist that everyone suddenly put up the boxes.
Reinder (and anyone else with domains already): I would, of course, like to see you put up the new box or banner, but if you really feel it's too intrusive or something, talk to me.