The SharePoint Object Model provides a property of an SPListItem called SPListItem.ModerationInformation.Status to allow you to determine the current content approval / moderation status if a document library has content approval enabled. The property ModerationInformation is an instance of the class SPModerationInformation and Status is an instance of the enum SPModerationStatusType.
How can I work with these objects / properties from the Client Side Object Model? The client side ListItem does not contain the ModerationInformation property like its server-side counter part.