I'm just about done with the development of my app and now want to start looking at incorporating ads into what will become my free version. What is the best way to manage the projects in xcode? Do you create another project that has the various changes for the free version, or do you build this into the normal project and take care of it at run-time? Obviously I don't want to have to manage two seperate projects with only small changes in code between them. Interested to know how others do it. Thanks!