Feature:
A box for all the notification that a user may get.
Why?
Well if phpBB going have @user tagging, we can't have PM going into people's inbox otherwise they will fill up. Not only that if we are going to have other features where there will be some sort of notification, we would need somewhere to put then.
How?
I was thinking something like how IP.Board does, all the post likes, new status and such get put into a notification box.





