I used brian kopps guilde on my alliance toons and i have the Joana's horde guide. The alliance guide worked pretty good. i was usually half a level a head of it. I don't know that it has been reworked since the quest xp changes in the recent patch.

I also use the Carbonite Addon which i have found is really nice for questing.

Not sure how well these would work for multiboxers though as it includes collection quests.