What is the advantage of a living will? And how does it work?

I have a Living Will, mostly to specify the Advanced Life Directives, so when something happens to me, no one will be in doubt as to my wishes. For example, I do not wish CPR or life support. I don't want the heroics. I also have added a Power of Attorney to that Will. I just don't want people that I love to make those decisions when I have already thought long and hard about my end of life. Both the Living Will and POA have been witnessed and notarized. My doctor has a copy of both.

You can find more information about a Living Will via the net:
Advance health care directive - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Living_will)
US Living Will Registry - Health Care Proxy & Advance Directive - Home (http://www.uslivingwillregistry.com/)
Living Wills & Healthcare Power of Attorney - Findlaw for the Public - (http://estate.findlaw.com/estate-planning/living-wills/)

There are other links in the Google page:
living will - Google Search (http://www.google.com/search?q=living+will&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7)