Hi, please share what you think are "must do" quests and why; I'll start:

Battle for undercity : you must do that one on all toons because of phasing but it's awesome and well worth doing

Drakuru / DTK / Encounter with Lich king: pre quests are horrible (need lots of random drop mojo x 5 x number of toons) so I only did it on 2 out of 5 but all can enjoy the sight : My team and the lich king

What else ? (my level 80 levelled mostly healing others in instance so I'm missing knowledge about lot of northrend quests)