Allow users to self-define by interest(s) in the Dashboard. Each checked role would trigger a block displaying feed of content appropriate to their interest. Could be documentation, or see LinClark's new article on RSS by role using microdata.
Interests (or roles) might include: New to Drupal, Developer, Site Builder, Content Editor, Web Master, etc.
Make it possible to change interests (roles), so that folks have the option to change as needed.