This module performs additional validation when a node is created or updated by a user to require that a node's title, author, language, and CCK fields are unique within a given context.
Also with this release we can have User and Taxonomy fields as unique.
This release includes a new feature and several bug fixes.
There is a new permission that allows users to bypass the unique field restrictions. The option to do this is displayed as part of the warning message about duplicate content.