I've done a bit of genealogy, tracking down my father's line back to the 1700's. A couple of weeks ago I found a possible link that would let me trace the family WAY back to before 1000 A.D., but I have a couple of not-verified links. I do know that DNA testing could prove that I was a direct descendant of one person a few generations older than my iffy links, so I may end up doing that...
My mother's mom has a bunch of family tree stuff for her side of the family, I really need to get with her soon, she just turned 88.
I really enjoy tracking links down, and can easily lose a week or so exploring different branches.