An approach that I have seen work well for a large number of organizations either implementing a new SharePoint 2010 enterprise implementation or possibly upgrading from SharePoint 2007 to SharePoint 2010 is to complete a “Phase 0” initiative prior to rolling out a full blown Phase 1 project. “Phase 0” is a term for a project that helps the organization take a deep look at themselves to develop a "SharePoint 2010 roadmap” and should be very forward looking into an organization’s I.T. strategy