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Atomic - 10:56 pm on Jul 21, 2008 (gmt 0)
Taking all but one ad unit off every page has brought me great results the last few weeks. I was down to two, but the lower unit was showing placement targeted ads in almost every instance. Removing it has boosted earnings AND made me feel even better about my sites. All that's left to try is Mr. Pages ideal of no ad units at all.
This turns the question "How many ad units should I use?" into "How many PSA's do I want visitors to see?"