DocMan is one of the best document management systems on the web.  And, the good news is that they now have a Joomla 3.0 version released.  This allows our websites to take advantage of the new features of Joomla 3.0 as well as the new power incorporated into DocMan.

DOCman 2.0 is a document and download management solution for Joomla. DOCman makes offering downloadable documents on your Joomla site a breeze.

folder You can visit our growing list of documents on this site where we use DocMan...it really is a great document management system .

Manage documents across infinite nested categories, give users permission to upload, download or edit documents, store documents locally or remotely, and prevent direct linking using the built-in anti-leech system.

Check out the overview at http://www.joomlatools.com/extensions/docman/overview.