From User Not Found's "About" section:

User Not Found is a weblog devoted to the discussion of dealing with the death of online friends. As more and more friendships/relationships are established and maintained in a virtual realm, more "real life" scenarios become relevant in the online environment. Death, unfortunately, is one of these scenarios.

There's really a need for a site like this. It's a new project, not updated frequently, but I hope it continues.'