In organizations, integrating mutually interacting software applications is a common problem. This problem is addresses in the enterprise by an Enterprise Service Bus (ESB) or Enterprise Application Integration (EAI). The problem is addressed in the Cloud by vendors such as Apigee and Mashery. This talk introduces Rackspace's proposed Restful Proxy Service Engine. REPOSE is like a traditional ESB, except that: the interface is REST; the protocol is HTTP and the scale is cloud. We will address the need for a cloud-scale service bus, the architectural limitations that prevent ESBs from scaling to the cloud, and the benefits of building a cloud-scale service bus into OpenStack, the next steps and how you can help.