A little OT but could use your help

For the past couple of years I have been toying with the idea of writing a book on the subject of simplicity. More specifically, simple living, or as some call it intentional living. Problem is that I’ve never written a full book before (usually short essays or commentaries) and I’m not sure where to start. So I thought I would start with you.
What topics would you like to see in a book on simple living/intentional living?
Obviously finances will be in there, but what other areas do you want to know more about in terms of how it applies to a simple living lifestyle?
What topics do you feel are over done in books on simplicity and should be only touched on with less print devoted to them?
What areas do you never see in a book on simplicity/simple living/intentional living but feel should be in there?

Any help you can give would be appreciated.