From the home page:
Ever wonder how your online friends would know if you died? Well, this is a question that has haunted me and I have come up with a solution.
How does Died Online work?
You login to the system every few days, or whatever time period you set it at. If you don't login within that certain amount of time, the system will email all of your friends with your custom "Hey, I'm dead now" message. You can also display a little dead or alive image on your website, online journals, emails, etc...
If you forget to login, we will email you asking if you are still alive. This is our "fail safe".
This is a great way to tell everyone your dead and to give a few last words.
You too can sign up for this service at Diedonline.com.