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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Comparing Genetic Ancestry and Self-Described Race in African Americans Born in the United States and in Africa (H/T Yann):
It is well known that different ethnic groups vary when it comes to diseases such as Type II Diabetes. Or, more specifically they vary in terms of risk, all things equal (if you use an online Type II Diabetes calculator you'll see immediately as they sometimes have a parameter for ethnicity).