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netmeg - 2:03 am on Sep 5, 2007 (gmt 0)
That was me, but bear in mind my site is 4th of July themed (mostly) so it's pretty much red white and blue and nothing else. How long has your site been up? ALL my ads are in PHP includes (it's how I do the random testing) and my ecpm is way up over last year. As mentioned above, it won't have any negative effect.
Meanwhile, someone else suggested that red links work better than blue.