Treat content as objects which can be described in terms of properties, categories and relationships.
Paradox of choice: Content should be organized in easily-understandable groupings
Progressive disclosure: Offer additional information only when it's needed
Exemplars: show examples (category names are not self-explanatory)
Multiple front doors: Your users will be first see your site at different places (e.g. via a google search leading to an obscure page); they all need to work
Growth: Accommodate new structures and concepts which will appear over time.
Multiple classification systems: All objects can and should be categorized in multiple different ways
Navigation by purpose: Think of navigation schemes in terms of their purpose, not their position on the page.