Past Venture Voice guest David O. Sacks launched Geni today, as TechCrunch reports, which aims to be the ultimate family tree.

Many have tried in this area before, none have achieved dominance. I've tried about 5 of these types of services in the past (including one from Joe Kraus's Jot) and none have caught on with my family no matter how many e-mails I've sent out.

Geni's got one of the fastest registrations I've ever seen, so I couldn't resist pestering my family members yet again. As I've said before, never bet against a PayPal alum. Let's hope that, as Valleywag eloquently put it in reference to his Hollywood venture, David Sacks has another "disgustingly successful foray".