25 presidents related:
http://www.postimage.org/image.php?v=gx33wV2i
Bush Family Tree:
http://www.youtube.com/watch?v=_ldZS9PL9KE&feature=related
Barack Obama related 6 U.S. Presidents
http://www.youtube.com/watch?v=HLaR6BgpJ7E&feature=related
A funny one:
http://www.youtube.com/watch?v=jyN1O-GwALI&feature=related
ancestry of various US political figures:
http://www.wargs.com/political/

this is idiotic. we are all "related", it just depends how far back in the gene pool you are willing to go. 3rd cousins, 9th cousins, 32498th cousins... at what point does it stop being significant enough for us to care about? at what point can we stop waving the "OMG ITS ALL A CONSPIRACY CUZ THEYRE ALL RELATED" flag?