Part of the greatness of P52 was being able to arrange my collection how I wanted it. When viewing my collection they would load in the order I preferred. This was partly about the display for others, but also to organize things myself. Keeping my Bicycle decks together, my NOC decks together, highlighting my Rare decks, etc. was a really nice feature. They utilized a drag drop system which makes a lot of sense from a UI standpoint. If you add in a "order" column to the DB and update it with an Ajax call might work. Just a thought.