I have written a plugin called "WP Flash Uploader".
'WP Flash Uploader' is a flash uploader that replaces the existing flash uploader and let you manage your whole WP installation.
The WP Flash Uploader does contain 2 plugins: 'WP Flash Uploader' and 'Sync Media Library'.
'Sync Media Library' is a plugin which allows you to synchronize the WordPress database with your upload folder. You can upload by WFU, FTP or whatever and import this files to the Media Library.
I want to include this as official plugin into the wp server soon but it would be great to get some feedback first. You find the plugin here: