It would be great if Collections allowed you to create subcategories (or subcollections). F.e. I have Strategies Collection. Subcategories could be Turn-based strategies, Real-time strategies, Simultaneous turn-based strategies and Construction & Management Simulations. You can surely imagine how to use subcategories in others collections. I'm sure this will allow many people who have hundreds or thousands of games to navigate their collection and find what they're looking for.