what is this addon called?

[Gum]

Hi guys..
I am looking for this addon.
http://www.youtube.com/watch?v=cmveO_DNevc
on this vid this guy uses raid markers, but also have it docked to the side that can be hidden or revealed to be out of the way.
Can someone tell me what that addon is called?
Can anything else be loaded on to it?
Ive seen some vids where peope have an raid grid attached to that, so you can hide your party if needed.