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Composite Application Guidance with updates for Silverlight 3 is now available on MSDN. Get it here

From project page

Note: This is a minor update to the February 2009 release. This release includes:

  • Projects refreshed to target Silverlight 3.0
  • Changes in DelegateCommand and CompositeCommand to no longer hold on to CanExecuteChange handlers.
  • The TabRegionControlAdapter was updated to set the context for the Header item to retain the same behavior as Prism 2.0.