Still having a few problems understanding this. For instance, in trying to implement the functionality that I hope the contacts package will do for me, I created a subsite, which I then wanted to customize. My thinking was that sub-directories would be placed somewhere, and files copied there, which I could then modify in order to customize the subsite. Of course, this didn't happen (no sub-directory anywhere) so I was largely at a loss as to how to customize. I guess there is something fundamental I am failing to grasp.