[xenophiles]

This project is very interesting, but I must comment on privacy:

A Note on Privacy To ensure the privacy of participants, we have built an anonymous analysis process. Your Participation Kit will be mailed with a randomly-generated, non-sequential Genographic Participant ID number (GPID). Although we will have mailed a Participation Kit to your address, we do not know the random code included in the Kit. When you send in your DNA sample with your consent form, they will only be identified by your GPID. Therefore, your cheek cells will be analyzed completely anonymously.

In other words, "trust us". If they really wanted to safeguard participants' privacy, they'd say "send us your sample marked with a 10-digit random number you make up yourself".

[CobaltBlue]

The consent form doesn't even allow your signature, you just black in a dot. It really is anonymous.