Fascinating letter! I would be very interested in participating in such a project. I think I would prefer the 25 marker test. Hopefully, if enough participated I might be able to determine which of the Strong brothers of the 1820 census for Smith Co., TN is my probable ancestor. But, maybe not since this ancestor is only 5 generations removed. If the test will only show a 50% probability I am descended from William (5th great grandfather), son of John of New Kent County, Virginia, then that won't be much help in identifying the Smith Co., TN missing link (3rd great grandfather). Still, since I'm the only surviving male of my line (going back at least to my grandfather, maybe even to my great grandfather), it seems desirable to ascertain and preserve my DNA profile for the benefit of others. Count me in. Robert Strong Scottsdale, AZ