Last night I attended an End of Life Planning Seminar with The Swenson Law Firm http://swensonlawfirm.com/
Sam Swenson esq taught us about the various kinds of end-of-life planning with their pros and cons.
Everyone also needs (oh crud! I forgot the name) but the thing that authorizes someone to act for you if you cannot. And possibly a separate document in which you say what life prolonging measures you do or do not want when things are dire. It is a wrenching thing for the family to have to decide life or death.