Access Control Service

Authenticating Users in a Windows Phone 7 App via Access Control Service, OData Services and Windows Azure   http://msdn.microsoft.com/en-us/gg192968

http://msdn.microsoft.com/en-us/identitytrainingcourse_acsandwindowsphone7_topic2

http://msdn.microsoft.com/en-us/identitytrainingcourse_acsandwindowsphone7_topic3