Pollan, M. Some of my best friends are germs. New York Times May 15, 2013.
Greenwood V. A Roller Derby of Bacteria. The New Yorker. April 17, 2013.
Heart Disease and the Microbiome. The Economist April 13, 2013 (Subscription required).
Scientific American Magazine. June, 2012.
Human Microbiome FAQ – Put together by the American Society for Microbiology, this document gives a great introduction to the human microbiome.