Assign roles to have permissions to do revisioning related activities. ie: "Revisioning allows you to assign distinct permissions for authors (to only create and edit content) and moderator roles (to review, publish, revert, unpublish and optionally delete content)."

Organic Groups

"Enable users to create and manage their own 'groups'. Each group can have subscribers, and maintains a group home page where subscribers communicate amongst themselves"

Options Element

Not really needed most of the time unless you find that you want to be able to have a prettier way of providing values for multi-value key|value lists.

"Options Element is a module that provides a better mechanism to specify select list, checkbox, and radio button options. Rather than requiring the user to use strange syntax like "key|value" in a textarea, Options Element provides a clean interface for specifying options. Developers may

Automatic Nodetitles

"auto_nodetitle" is a small and efficient module that allows hiding of the content title field in the form. To prevent empty content title fields one can configure it to generate the title by a given pattern.

When the token module is installed it's possible to use various node data for the
auto generated title - e.g. use the text of a CCK field (since 5.x).