I regularly read the blog Lifehacker, which is basically a collection of tips for making life easier. A few weeks ago, I came across this article on what you need to do now to prepare for death.
As the author observes, none of us likes to think about death. It will come to us all eventually, though, and some planning now will make it easier on everyone, including you, in the long run. Some of the information is very specific to American residents, but it is a great read if you are starting to think about what you need to do.