Cloud platforms ranges from proprietary API and services like Google App Engine
to open systems like RedHat OpenShift. Developing applications, to run seamlessly on a variety of cloud platforms, without platform lock-in, has its own challenges.
Now a step-by-step guide shows how to develop Google Web Toolkit (GWT) web application and deploy it on Google App Engine and OpenShift without platform lock-in.
A good resource for beginners and intermediate users to start with Cloud Development.
Read the Online guide at https://sites.google.com/site/gwt2tutorial