Best way to get to 75-80 by cataclysm release? Currently Instance Buddying dungeons as a disc priest.
Shola at 76, and a little into 77. Then Icecrown. 5-6 hours and you're done (via questing)
If not, its a very long grind in hb
Ebon Hold? yeah you gotta simply do the oculus quest (the quest name, not the stupid gay dungeon)
I just did those quests and the chain started with the argent crusade post right outside dal and led into the sauron eye and ebon hold quests.
Shola at 76, and a little into 77. Then Icecrown. 5-6 hours and you're done (via questing)
If not, its a very long grind in hb