So I was wondering whether would it make sense to have a reciprocal segue when navigating down a hierarchy of categories of unknown depth in ios5? I was thinking that the iOS navigation controller should provide the back button stuff etc., but it seems like if I was setting this up in a storyboard then I need to keep on seguing over and over again to the same controller displaying the current list of categories ...After some help from iphonedev on irc.freenode.net I wasn't able to create a segue from one viewcontroller to itself, but I was able to make a seque to a clone of that view controller (Option Key drag to copy out of the left hand list view of items, thanks Psy) and I got the convoluted hook up pictured here. Seems remarkably unDRY, but it works and I can now navigate up and down the category hierarchy with the navigation controller handling the back button to get back up again as necessary.
