ATTENTION: Windows Azure platform AppFabric has transitioned to commercial availability on April 12th 2010, and is now a fully SLA-supported paid service. Customers who use AppFabric will be notified of their usage, as charges have begun accruing as of 11:00 PM (UTC) on April 12, 2010.

http://www.microsoft.com/windowsazure/appfabric/