A topic that I think BizTalk professional find appealing in Windows Azure is the Service Bus (part of Windows Azure AppFabric). Service Bus provides secure messaging and connectivity capabilities that enable building distributed and disconnected applications in the cloud, as well hybrid application across both on-premises and the cloud.
One of new features is topics and queues. Clemens Vasters did a talk on Windows Azure Service Bus Topics and Queues during Windows Build and an advanced one, which you find on his blog.
You can work with this new feature through Windows Azure AppFabric SDK V1.5 - September 2011. The version 1.5 SDK includes an updated Service Bus assembly that includes support for durable, or “brokered” messaging features, such as queues, topics, and subscriptions. These features require the .NET Framework version 4.0. (Note: If you have a dependency on the .NET Framework version 3.5, you should download or continue to use version 1.0 of the AppFabric SDK.)
If you have virtual machine available or laptop following requirements are applicable:
Labels: Microsoft Azure, Service Bus, Windows Azure AppFabric