I have been working on a family tree. So far I have collected over 2000 people, and I've been able to follow several lines back into the 1500's. I have also found relatives in California that I did not know existed, and I've been able to connect to distant relatives all over the world who I had only heard about. I am planning to put this tree online (with some obfuscation for living relatives), but it's a bit of a job.
One of the sources is a family history for the Menhardt's, which my aunt Freia put together.
Another is this site which was created by a distant relative on my father's mother's side.