I was just reading a blog that had 5 vertical skyscraper AdSense displays stacked on top of each other down one column of the page. I guess I can't reveal the URL but this blog gets a lot of visits. It got a lot of press mentions a couple of years ago after breaking some news important to the US Presidential election.
Are there special rules for blogs?
Is having more than the 3 allowed displays on a page just one of those things AdSense is not likely to detect or care about?
FarmBoy