Using ACS as an OData token issuer
Not all cloud applications have web interfaces. This sample shows how to call the ACS from a Silverlight application and get a claims based token to use on an OAuth enabled WCF application.
there are many examples about this. See for instance the wp7 + ACS lab at http://msdn.microsoft.com/en-us/IdentityTrainingCourse_ACSAndWindowsPhone7.
Eugenio Pace commented
There are samples of this in the training kit and in the ACS sdk.