Recently I was doing some research on SharePoint Governance. I was browsing through some slideshare presentations and there I found this absolute gem: the SharePoint Business Model.
Ben McMann from Tribridge talks in this presentation about the SharePoint Business Model. In my view, any project ( not just SharePoint) should start with making up such a thing. This should be the basis of your governance, the start on why and how you are going to manage things.
I know I am going to do this exercise before I start a new project!