As I've stated elsewhere, my interest in the human microbiome became much more personal when I began to consider the potential for improving human existence. Specifically, I learned about the potential role that our "gut bugs" may play in neurologic conditions such as Parkinson's Disease, which my grandfather has. This first came to my attention in the video below, which recently appeared on PBS's Nova series. It's a nice introduction to the microbiome, as it's presented in everyday language that the non-scientist can understand. Click this link: What's Living In You?
I highly recommend it!