This is cool.
How to Participate – The Genographic Project
With a simple and painless cheek swab you can sample your own DNA. You’ll submit the sample through our secure, private, and completely anonymous system, then log on to the project Web site to track your personal results online.
This is not a genealogy test and you won’t learn about your great grandparents. You will learn, however, of your deep ancestry, the ancient genetic journeys and physical travels of your distant relatives.
For males this includes a test of Y-chromosome DNA to “to identify your deep ancestral geographic origins on your direct paternal line.” Females mitochondrial DNA is tested to trace the direct maternal line.