fpoller

Gives the following options for making the WordPress installation more private:
<ul>
<li>Protect content from being viewed to users who hasn’t logged in</li>
<li>Disable all feeds</li>
<li>Only serve uploaded files to logged in users</li>
<li>IP address based exceptions for the above options</li>
</ul>

Private WP suite

Adds option in the admin panel for making your blog (including rss feeds and uploaded files) private.

Ian Dunn

By default WordPress doesn’t overwrite an existing file if you upload a new one with the same name and directory. Instead, it appends a number to the end of the filename in order to make it unique, e.g., <code>filename.jpg</code> becomes <code>filename1.jpg</code>.
That isn’t always the desired behavior, so this plugin makes it so that any files uploaded will automatically overwrite existing files in the same folder, rather than creating a second file with a unique name. It will not overwrite files in other folders.
After activating the plugin, you won’t need to do anything else, it’ll start working automatically. If you run into problems, please check the FAQ and existing support forum posts before opening a new support request.

Overwrite Uploads

Overwrites files with the same name and folder when uploading, instead of storing multiple copies with unique filenames.

Private WP suite vs Overwrite Uploads