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There doesn't seem to be much information on this topic. This is what Google has to say about it "Determined algorithmically, these highlighted brand names may help you find what you're looking for faster, and make your research and shopping experience all the more enjoyable." Some discussion on the subject: Official Google Blog: http://googleblog.blogspot.com/2010/05/this-week-in-search-5110.html Google Support: http://www.google.com/support/forum/p/Web%20Search/thread?tid=5c29922f70bebfa0&hl=en