Gotta say....woah...
Apparently, some quests will allow the remote quest system.
What this is, is basically you can hand in your completed quest without having the visit the NPC who gave you the quest.
Check it out:
Quests
Remote Quest System
A new remote quest system has been added, allowing you to receive and complete some quests out in the field, without having to visit the starting NPCs. When a quest is completed and ready to turn in using this system, you will see a graphical alert on the quest tracker.
Quest Tracker - Minimap Arrow
The quest tracker has been further enhanced with Cataclysm, now displaying an arrow on your minimap directing you to the "#1" quest in your quest tracker. It's recommended you sort by proximity to take full advantage of this arrow.
Posted Image
Kill Target Enhancements
Kill Target quests, primarily those for "named" NPCs will now display a window to the right of the quest dialogue that shows the model for the NPC you must kill, as well as a bit of flavor text.
Source: http://worldofraids.com/