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incrediBILL - 8:10 pm on Mar 28, 2008 (gmt 0)
I was always of the opinion that blending too tight, like Google's examples, was akin to enticing click fraud IMO and it was just a matter of time before the shoe dropped when the advertisers discovered the high bounce rate of visitors tricked to click.
I always titled my ads "sponsored links" as I never tried to trick visitors into clicking so I'm not terribly concerned for my sites.