WP Document Revisions is a document management and version control plugin for the popular content management system, WordPress. Built for time-sensitive and mission-critical projects, teams can collaboratively edit files of any format — text documents, spreadsheets, images, sheet music… anything — all the while, seamlessly tracking the document’s progress as it moves through your organization’s existing workflow.
The plugin by Ben Balter looks quite interesting and full featured. Looking forward to a chance to try it out and in real environment!
Full details and screencast at http://ben.balter.com/2011/08/29/wp-document-revisions-document-management-version-control-wordpress/