Creating a site map of the pages you get a typical tree structure, with the homepage at the top and all the content on the lower 'branches'.
Customers want instant information about the organisation. They want to know some of the stuff on the lower levels and don't necessarily want to have to forrage for it through the navigation to find it.
Search engines also want content to spider and understand the site. The more this content is relevant and updated, the more likely the spiders are to return.
This therefore means exposing the content as quickly and effectively as possible and dispensing with conventional information hierarchy... or in other words turning your site map upside down! Content rightly therefore becomes the empowering factor.