Geni.com does a good job of allowing you to very easily create a family tree. It’s nice because you start adding members of your family and if you add their email addresses, they will be notified. Once they are notified, they can log in and make changes to the family tree and add more details. Of course, the number 1 concern here is privacy. The good news is that Geni has lots of privacy settings.
As far as I know, the company has raised more than $10 million dollars in VC money. I know that they make some money off of selling premium accounts but I’m not sure if that business model will be enough to make them nicely profitable… maybe I’m missing something…
All in all, great website. Try it out!