I just finished reading the latest book from Spencer Wells and it's a winner. Deep Ancestry: Inside the Genographic Project strikes the right balance for beginners and those who are already immersed in the world of genetic genealogy (aka genetealogy).
It provides an excellent overview of National Geographic's Genographic Project. That might not be a huge surprise since Dr. Wells is the director of the project, but what I appreciate about his writing is that you don't have to be Harvard and Stanford-educated (as he is) to follow it. This book is for everyone. And this project is for just about everyone as well, with more than 160,000 participants -- not too shabby for an initiative that launched in April of last year.
If you're just venturing into the world of DNA, you'll find it easy to grasp, and finally understand what all the fuss is about. And if you're a seasoned "pro" (that is, someone who's been dabbling in this world for, say, three or more years), you'll love wallowing in all the haplogroup descriptions and details.
So if you'd like to better understand this effort to essentially create a family tree of mankind and its migrations, why not snag a copy of this book? And if you're so inspired, join the project itself . For that matter, this book (and/or a kit from the project) would make a great gift for that annoying person on your list who already has everything!