What happens when you die?

I've had this discussion with one friend and wanted to throw it out to see what your view or solution is regarding what to do with online property. Hence, what should be done with your FB account, blogs, twitter , etc. when you pass away. Should passwords be left to your loved ones in your will? Should notification of your death be sent to sites that you subcribe to. Is this a new untapped market that we need to supply service to?