Drafts allow you to work on pages with the confidence that they won't be published. You can even set publish and expiry dates for ephemeral pages.
Archetypes are a unique way to manage page configurations as your site grows larger, customizing many pages from one central location.
Shared Configurations give you the freedom to define your own Archetypes and apply them selectively.
Orchid's has a simple yet powerful convention for finding pages and generating links throughout your site.