"The Sorenson Molecular Genealogy Foundation (SMGF) has built the world's foremost collection of Y-chromosome DNA data and corresponding genealogies. Currently, the Sorenson Y-database contains data from more than 39,000 men throughout the world." Use of the database requires free registration.
Sorenson Y-Chromosome Database (Wayback Machine)
Sorenson Y-Chromosome Database (Wayback Machine)