I've picked up a project from curse that was stopped over a year and a half that might be useful to many people.
this add-on is basically a whiteboard, it opens a window that u can draw on and place raid icons that will let other ppl who also have the window opened and are on the same channel as the person drawing to see what is being drawn as it happens.
I think this would be handy in explaining tactics with drawing when new tactics and new bosses are being introduced in cata.
the add-on is on curse on.
wow.curse.com/downloads/wow-addons/details/whiteboard-cont-for-bc.aspx
if u got any issues about the add-on or have any ideas please done hesitate to tell me about it