Chris Klosowski

Allows you to upload your themes CSS, JavaScript, and Images into your Dropbox ‘Public’ folder and server these files from the Dropbox network, reducing the bandwidth of your server and allowing users to load your site faster. Please note that as of now, this plugin only supports themes who use the filters ‘template_directory’, ‘template_directory_uri’, ‘stylesheet_directory’, and ‘stylesheet_directory_uri’ to determine the paths to the theme’s template and stylesheet files. I would only suggest this plugin for users who aren’t afraid of getting their hands a little diry.
This plugin is in no way affiliated with Dropbox.

Dropbox CDN

Use your Dropbox 'Public' folder as a free Content Delivery Network (or CDN). Please read the full description.

Morgan Estes

Content Delivery/Distribution Networks help speed up a website by loading assets from multiple sources around the Internet. <a href="http://www.coralcdn.org/" rel="nofollow ugc">CoralCDN</a> provides a free network of servers to help website owners easily offload resources to improve the performance of the site.
This plugin automatically enables the network for images added to a post or page.

CoralCDN

This plugin enables using the Coral Content Distribution Network to speed up your website.

Dropbox CDN vs CoralCDN