With Google’s recently approved purchase of DoubleClick, they have also acquired the SEO company Performics. Google owning a company that sells services that help companies rank well on their engine is a clear conflict of interest, but there’s even more to the story.

Check out the open letter to Google that appeared on SearchEngineLand.com the other day. I think it does a terrific job of illustrating the uneasiness many are feeling about this particular aspect of the DoubleClick acquisition.