Blaine Bettinger at the Genetic Genealogist has an extensive and thoughtful critique of the American Society of Human Genetics' recently released statement on genetic ancestry testing (pdf). (You can read about the Society's statement at GenomeWeb News and Science Now; 23andMe also comments from the point of view of a company engaged in ancestry testing.)
If you have comments on the issues surrounding genetic ancestry testing I'd encourage you to add them to Blaine's post.
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