I did every single quest in Borean Tundra, Howling Fjord, Grizzly Hills, Dragon Blight, and Zul'Drak. I also did enough quests in Icecrown to unlock all the dailies on the skyship and shadow vault.

The problem with questing in Northrend is that you only get a small amount of quests in each hub. Say 2-4. Issue is that they are ALL quest chains. Do these 2 quests and come back for 2 more. So if you take a look at say thottbot at the quests, there are a lot of quests that are MB friendly. Its just not MB friendly to unlock them. However almost all the daily quests are MB friendly. Only a few are not like the walrus peoples quests. So once you get them unlocked, (for me at least) they became a primary source of xp while leveling.

There is a Northrend quest guide in one of the stickies that is fairly MB friendly. Sevugas brain dump or something. I remember looking at it a while back, but was not impressed with the whole MS silverlight and ui plug-in thing. I prefer a nice easy txt doc or something like Jame's leveling guides that you can just reference in a browser.