CCK sync
CCK provides CRUD (Create, Update, Delete) functionality to add fields via code. CCK also provides a utility module called content copy. The module also CRUDs group fields.
This module uses both of them so you, the developer, don't have to be bothered keeping your content type in sync - you simply export your CCK content type to code or file and cck_sync_crud($content) will do the rest.
Module adds a "Sync" menu item, altough you would usually use it with hook_update_N().
