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Originally Posted by Harmon
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1. In-depth articles
According to the MozCast Feature Graph, 6% of Google search results contain In-depth articles. While this doesn't seem like a huge numbers, the articles that qualify can see a significant increase in traffic. Anecdotally, we've heard reports of traffic increasing up to 10% after inclusion.
By adding a few signals to your HTML, your high quality content could qualify to appear. The markup suggested by Google includes:
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Hmm, you accidently forgot to include the link to the original, I think.
12 Ways to Increase Traffic From Google Without Building Links - Moz 
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