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Undead_Hunter - 3:35 pm on Jan 21, 2005 (gmt 0)
We tested this recently. Removed 2 ad banners, replaced with just 1 on a different part of the page. We're getting *double* the click-thru rate, and we have about the same daily payment as before. I expect it will go up during the year as well. It's important to track your ad channels seperately so you know where people are clicking on a page. On some pages, ads are better shown at the top, and others at the bottom.
Have you tried removing all of the skyscrapers, and showing just the top few ads? Say, just 3 or 4 ads?