My alliance death knight made it to Northrend during this past week. This is the first time I've worked on leveling an alliance toon through Northrend and the differences are pretty interesting. the alliance definitely seem much more upbeat about things once you hit the shores of Borean Tundra than the Horde were. Valiance Keep is also a much nicer place than Warsong Hold - although you definitely feel more like an attacking army at war over in Warsong Hold.
I've also been working through Molten Front dailies on most of my toons. I have now completed the Molten Front on two characters - my warlock and my hunter - and am very close to having them done on the death knight. I've also started to finish up the quests in Hyjal needed to unlock them on my shaman. Once that is done, it'll just be the priest that still needs to unlock them.
I've been debating running some dungeons as dps on my death knight just to collect some Chaos Orbs. He's my max blacksmith, and it's just become very apparent to me that I just don't enjoy tanking. I'm not a huge fan of melee dps either, but seems like that's an easier route to accumulating Orbs since it's apparent they're not going to become BoA or tradable anytime real soon.
So for now, I'm trying to balance working on Molten Front dailies with leveling my alliance death knight. So we'll see how that goes.