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My question is - relatively speaking, how damaging to SEO is it to have BOTH your development/testing site and your live version indexed/crawled by Google and appearing in the SERPs? We just launched about a month ago, and made a change to the robots text on the development site without noticing ... which lead to it being indexed too.So now the ecommerce website is duplicated in Google ... each under different URLs of course (and on diff servers, DNS etc) We'll fix it right away ... and block crawlers to the development site. But again, may general question is what is the general damage to SEO ... if any ... created by this kind of mistake. My feeling is nothing significant