I've been using wordpress for years. I create sites and manage content for quite a few clients. I think a media file manager would be very beneficial to clients with a large spread of content that is used on a regular basis. Newspapers, photographers, and content specific bloggers would all have a need for a quick way to search content that they've already uploaded to their media file.
** maybe organized by categories on multiple levels (i.e. sports -> football -> area teams)