Delivering notifications with the Windows Push Notification Service and Windows Azure

You can get the code from the demos on my blog, here at: http://www.thejoyofcode.com/Building_Applications_with_Workflow_and_Azure_ndash_BUILD_2011.aspx
Josh
Great session Josh! Really enjoyed watching it!
What is going to be the recommended way of utilizing the power of WF in Azure in the future - using a worker role where we invoke the workflows and use SQL Azure for persistence or using the AppFabric Applications where we consume WF as a service and use the Service Bus? I remember you making a demo some time ago about the AppFabric Apps too.
Greetz