DDPersistentDocument
Lion/Mountain Lion support for wrappered core data such as documents created by UIManagedDocument. It can stand alone however even if you dont use iOS iCloud syncing.
This subclass on NSDocument allows you to use the standard 10.7/10.8 Documents based app features of Duplicate/Autosave/Versions with Core Data
The class is designed to read the wrappers produced by UIManagedDocument hence expects to find the persistent store in FileName.foobar/StoreContent/persistentStore
It also currently does NOT support Ubiquitous coredata. Any iCloud syncing done will be atomic style "Last man in wins" .This works pretty well for a lot of situations and given how interesting Ubiquitous Coredata is; this might be considered a positive.