Apparently, "SuperServers.org is a free service designed to increase the availability of multimedia content stored on slow or otherwise inaccessible web servers.
It works by storing a temporary local copy of all accessed content which is then served directly to any users subsequently requesting the same data - thus greatly reducing load on the source server.
To start using SuperServers.org now, you can simply append '.superservers.org' to the hostname of any url you wish to access."