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DNA

Sanger DNA Testing   
The Genetic Genealogist Blog    This is Blaine Bettinger's DNA Testing Blog.Blaine normally posts 1-2 times a week. He covers a wide variety of information on genetic genealogy but does a really good job of covering X-chromosome research, the topic of genealogical standards for DNA testing and the technical details necessary for understanding the limits on using this information.
Your Genetic Genealogist Blog    CeCe Moore's DNA Blog. As of January, 2015 CeCe is mainly posting about various DNA kits sales due to her busy research, travel and speaking schedule. This is a great one-stop shop for the latest ways to save on kits.

General

DNA Testing from Illumina   
DNAeXplained - Genetic Genealogy     Exhaustive DNA information plus a fascinating story on the orphan train.

Third Party Tools

Using GEDmatch    GEDmatch is probably the single most useful 3rd party tool for working with your autosomal DNA. It allows anyone who has autosomal test data from AncestryDNA, FamilyTreeDNA or 23andMe to upload it to the GEDmatch site and work with their matches.This articles gives detailed guidance on how to use GEDmatch and many of its options.