The $1,000 Genome: The Revolution in DNA Sequencing and the New Era of Personalized Medicine

The author does cover the material very well, and most importantly makes the topic relevant to the reader. The topic is exciting more because of what could be than what is. The reader does something which I liked, when quoting a Brit or Irishman or Italian he'd give them a strong appropriate accent and I would always realize the material was being quoted. Makes listening easier.
It's not a science book, but it does cover the business end and what to currently expect from getting tested.