LightHeaded displays all comments from WoWHead for your quests. Most people are nice enough to put coordinates in their comments. LightHeaded also displays coords for the start/end NPCs for the quests. If you use TomTom or Cartographer, you can set waypoints to those coords, to have an arrow point the way. If you use nQuestLog, you can click on a comment with coords in it, to select the coords and automagically set the waypoint. nQuestLog also has MobMap integration.
Anyway.... everyone's different, it just seems like there are easier, pre-existing ways.
