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”.