It's our Tree appears (www.itsourtree.com) to be gaining popularity over Geni (www.geni.com). Both applications appear to allow multiple users to update their family tree in a friendly UI (User interface). Currently, I am exploring Its our Tree with my enthusiastic cousins, and although I would like to see additional features, so far it's been smooth and fun to use. If you have an interest, this may be an alternative to sharing the responsibility (and the work) of updating your tree for the next generation. BTW: Only people in your family tree can view your tree.