NSIncrementalStoresubclass that uses
AFNetworkingto automatically request resources as properties and relationships are needed. I had noticed NSIncrementalStore in the iOS 5 docs a while ago, but it was this article that got me to realize how unbelievably cool it was.
I can't tell you how much this is going to revolutionize the way many apps integrate with their backend API systems.
Please do yourself a favor and go checkout the project's README immediately.