Make your will.
Neil Gaiman has explained why this is a good idea: While you may not care about your possessions, consider what may happen to the rights to your work after you die. Having your literary executor named in your will helps your survivors respect your wishes with respect to your work.
Neil's also provided a form that U.S. authors can use to create their own wills. Canadians, consider visiting a lawyer, or, if you're skint, you can buy one of the many kits that are available, or use a free one. Do take into account what will happen to your literary estate (an entity that is, as Neil points out " a separate thing from the disposition of our second-best beds".)