I serve in a local Family History Center, a branch of the Family History Library of the Church of Jesus Christ of Latter-day Saints. One evening I discovered a seven-volume set of books called "Colonial Families of the United States," and wouldn't you know it, I'm related to a good fourth of the people listed.
How awesome.
Since then I've added about 1,000 people to my PAF file. My Gran would be so proud.