Les Harris

The Pressbox plugin adds a new tab to the Media Upload screen that allows you to insert images and files from Dropbox into your posts.
Additionally, the plugin provides a new shortcode that lets you add links or display images anywhere you want on your blog.
This plugin is under heavy development so please feel free to send me feedback, bug reports, and feature requests!
Credits:
This plugin bears a great debt to the work of Joe Doleson’s Wp To Twitter plugin for his excellent example of OAuth integration with WordPress.

Pressbox

Integrates DropBox with your blog allowing you to post images and files directly from your DropBox. Requires PHP 5.2 and cURL.

Blighty

This plugin allows the complete file structure of a folder in Dropbox to be shared within a WordPress page or post. The folder can then be navigated via the WordPress site and files selected and downloaded. Changes in the Dropbox folder, such as the addition or deletion of files, are reflected through to the WordPress site.
<h4>Features</h4>
<ul>
<li>Shows a folder/file navigator that mirrors a folder in your dropbox account.</li>
<li>Optionally display file size and file date in the folder display.</li>
<li>Allows for file uploads, either to a dedicated hidden folder, or to the currently displayed dropbox folder.</li>
<li>Allows access rights to be set on each top-level subfolder.</li>
<li>Compatible with most lightbox-type image plugins.</li>
</ul>

Blighty Explorer

Allows the complete file structure of a folder in Dropbox to be shared and navigated within a Wordpress page or post. It also allows for file uploads.

Pressbox vs Blighty Explorer