Moderate
When a user uploads a file, the module removes any permission to view it.  Only the admin has this ability.
The admin page shows elements in "ToApprove" list and you have to take an action: if approved, permission are restored; otherwise the item is deleted.
Installation
You can install this module by:
-  Going to Site Admin
-  Clicking on the Plugins link from the left side.
-  Then click on Get More Plugins Tab.
-  Then click on Show Repository List.
-  Then check the box that says "Community Plugins"
-  Then click Save
-  Then Click Download Plugin List
-  You will then see the Module 'About Page' listed under 'Display'.
-  Then click on Download
For more details see:
http://galleryproject.org/node/48148