Shhh! Here's a well-kept secret. I have links to articles I've written on "genetealogy" back to 2001 on one of my websites. If you're new to the world of genetic genealogy, you might want to take a browse through this mini-library. If you're looking for a primer -- an introduction to the various types of tests that are available and what you can learn from each of them -- be sure to check out Demystifying DNA in .pdf format (thanks to the good folks at Family Tree Magazine for letting me share it with online readers).