This is completely wrong. Rackspace's Block Storage offering is built on OpenStack Cinder which has nothing to do with Cloud Files, it's backend data store, the

This is completely wrong. Rackspace's Block Storage offering is built on OpenStack Cinder which has nothing to do with Cloud Files, it's backend data store, the servers it runs on, or the regions it runs in. Openstack.org has plenty of information on how Cinder works.