Saving Data

I just added functionality to the Cocoa Bindings MailDemo app so that it saves the data I enter to the disk.  It's really cool to see it work now because everything that I enter into it is saved.  When I open the application again all of the same data is there.  It's amazing how easy it is to do this and it's cool to see it working.  Now I just have to apply all of this to my application.