I know I have some add-ons I still need to finish up but a user of mine asked if I could make a profile tab for their gaming collection/library
So I would find a database of existing games for selected platforms and a cron would run ever so often to find and update that database for new releases.
A member of your site would then go to a page and find/select all the games they currently own and it would be added to their profile tab "Game Library"
From their Library they would also be able to pick "currently playing" which would update their status. They also be able to 'star' their favorites.
It's more for "looks" rather than function, but a gaming site may really enjoy this. Could also be used for other 'collections' like model trains, guns, toys, etc.
I can see certain collections getting very large so I would enable pagination or limits