The AppFabric team has released the AppFabric LABS environment. This environment can be used by customers to test out and play with experimental AppFabric technologies, free of cost.
The AppFabric also plans to use this environment to showcase some early bits and get feedback from the community. Read More over here Now Available: The Windows Azure platform AppFabric LABS Environment
What is the Windows Azure AppFabric?
Windows Azure platform AppFabric helps developers connect applications and services in the cloud or on-premises. This includes applications running on Windows Azure, Windows Server and a number of other platforms including Java, Ruby, PHP and others. It provides a Service Bus for connectivity across network and organizational boundaries, and Access Control for federated authorization as a service. Read more