sites 6.x-3.x-dev

Five new submodules:
Sites Clone (clone a menu and nodes into a site)
Sites Extra Fields (add extra data to a site object by connecting it with a node)
Sites Import Export (import and export menus, nodes, and sites)
Sites Path Aliasing (allow the same Drupal URL to be reused on different sites to point at different nodes
Sites Taxonomy (associate each site with a Taxonomy term so that applying the term to a node assigns it to a site)

New sites_maintenance hooks which allows modules to clean up the database and perform other tasks.
New hook_siteapi which is fired on a variety of different events.
New cookie functionality which remembers which site a user last visited.