A text version of the piece points out: "... few people have taken steps to plan for their digital afterlife. It's not yet common for people to include their online information in their wills, [John] Dozier [Jr.] says. And even if they did, and the properties were legally transferred to the beneficiaries, terms-of-service agreements on sites like Gmail and Facebook typically prohibit the use of an account by anyone other than the original owner, he says."
It's undoubtedly something we'll hear more about in the future as the portion of the population that has greater web presence begins to age. But man, it would never have occurred to me to include email passwords in my will.