I basically pick and choose quests between Tanaris, Feralas and Hinterlands. After I finish Uldaman, that is. I usually start with Tanaris (wastwander justice, water pouches, pirates, etc.) then run to Feralas, pick up FPs and do a few on the island. Then head back to Hinterlands for the Wildhammer Keep stuff. That usually takes me to 44ish, at which point I'm ready for ZF, which takes me to 47 or so.