Entrustet is a free new site (currently in public beta) that allows the user to collect all their digital assets (social networking accounts, e-mail accounts, etc.) and assign them to an heir that can have access to them after they die.
Although the founders seem a bit sketchy/pervy, they’ve definitely found a niche concept that will be increasingly important to people the more we rely on the internet to get through life. Official launch is April 26th.
More info and a breakdown of the site here.