publicfile.org is a site that distributes extensions / additions / enhancements to publicfile, the static content only http / ftp server.
publicfile is a http / ftp server which only serves static content, but does so extremely effectively. It's a popular choice for static file hosting systems.
Interesting article on offloading images to Amazon's S3 service to improve site performance (WordPress in this case).
Comparison if free, short term, static file hosting companies. Potentially useful for anonymous publishing.