Until now, the only way to obtain this information was through one of several DNA companies, and at a much higher price. It is not yet clear what information you will get from your sample, so anyone who has already learned their place in the mtDNA and Y-chromosomal phylogeny (::weep:: me) should probably wait before they join in.
Also, of interest in the Genographic Project site, the interactive Atlas of the Human Journey.
Actually, it appears that males only get the Y-chromosomal test and females get the mtDNA test.
How to participate
Samples will be analyzed for genetic "markers" found in mitochondrial DNA and on the Y chromosome. We will be performing two tests for the public participants:
Males: Y-DNA test. This test allows you to identify your deep ancestral geographic origins on your direct paternal line.
Females: Mitochondrial DNA (mtDNA). This tests the mtDNA of females to identify the ancestral migratory origins of your direct maternal line.