As part of #546956: [meta-issue] Overhaul of Information Architecture we have identified the top-categories that can house 60/70% of the modules that will live in a Drupal install. However as we pointed out in that issue already, we need to create a few more categories to house 20/30% of the other modules - so that their is consistency in categorization.
For example, back in D6 - one could have a category "User Interface" , "User interface", "UI" ect. We want to create a sensible default category and go with "User Interface". Its important to note, that every category should be able to house a few modules - and not optimized or designed for just one module (this can be done by the module itself, if its truly that required).
More background :
The goal is to discuss and decide upon this additional categories, please be aware of our 3 week time-schedule.
admin/config/management => Management
admin/config/user-interface => User Interface
admin/config/e-commerce => E-Commerce