Cloud computing is among emerging technologies for high speed, complex computing. Cloud computing means anything that involves delivering hosted services over the Internet. These services are broadly divided into three categories: Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS). Virtual resources and computing assets are accessed through the cloud, including not only externally hosted services but also those provided globally by companies. This provides the basis for the next generation of enterprise data centre which, like the Internet, will provide extreme scalability and fast access to networked users. In this article, we analyze different standards for Messaging, Security, standards for Application Development and the role of Open Virtualization Format (OVF) in virtualized environment for Cloud Computing. We have suggested security aspect with a proposed architecture for relationship and intersection between Service Oriented Architecture, Grid Computing and Cloud Computing.