Visible Player Name/Gamer Tags
As it says on the tin. I think it'd make it easier to find your friends, and also avoid people you don't want to really interact with. This would help with a lot of the group harassment issues in game if you can put a name to a face/dinosaur. I also think it should be toggable, much like it is in other MMOS like WoW so that you have a choice to display names or not for your immersion (In case someone's username is like Buttfart69 and you just don't want to see it. haha.)