I report any splogs with Adsense ads to Google. I do this by clicking on the Ads by Goooogle link in the offending ad unit and filling out the form. Google has responded by email with a better way of reporting Adsense splogs.
Google Adsense Team: In the future, to allow us to investigate any issues more efficiently, you can email our specialists directly at adsense-abuse@google.com.
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