Using a plugin called subscribe 2 I have set up a system that lets my readers subscribe to automatic email notifications.
Not everybody are using RSS yet, so for the people that want another way to get notifications this system seems good.
I have only found one bug, and that is not a bug in the plugin, but a bug in WordPress. If you post by mail or by using software like w.Bloggar people will not get a notification.
You can register for automatic updates from eirikso.com here.