Ordered Folders actually patches the ObjectManager to become the OrderedObjectManager and then simply provides a Base Class for the OrderedFolder. Ordered Folders allow your objects inside the Folder to have a specific order. This is especially useful, if you want to display the object in a certain order that is not dependent on any variable.

Let's take Martijn Faassen's product Formulator for example, where the single Form Fields need to be in a certain, user-defined order. He could simply use the OrderedFolder as a base class for his form and receives instantanously order support. At iuveno AG we needed this product to implement similar functionality for some new parts of the Kontentor (which will be published soon).

This functionality should be really part of the Zope core and not be a separate product. If more people see the need for this type of object, I will put a proposal into the Fish Bowl.