Leave the dungeons and do your quests... or you will probably never go back and do it. Just say that I will do xx amount of quests a day that i play and do like 10 or something if you really dont want to you know.
IceCrown Zul'dak and Stormpeak quests are fun. I am a bit piss that i have been too tire after work to concentrate on them on my current team. I just do random dungeon for emblems and some dailys most evenings. I have done this since 75, almost 79 now. Yeah a drop or collection quest in the middle of a quest chain really sucks sometimes.
another thing is that since i havent done the fraction quest, i am not friendly so i cant get the tabards for dungeon runs.
@ Lightstriker:
As far as tabards, I just discovered that the Triumph emblem vendor in Dalaran (just outside the Inn, up the stairs for horde) sells rep tokens for the tabard-reputation factions that would get you from neutral to friendly for a few emblems, then you could grab a tabard and get to exalted from that point. I'm sure lots of people know this already, but it was a new thing to me :)
This ^. IMO, just do all the quests. You get used to doing collection quests. Its not like you have a deadline to finish the game anyway (unless you do...). So far I have not found a collection quest worse than the quest in hellfire (outlands) that had you pick up 30 airship parts. That one was the worst! Plus you will make a lot of gold and open up dailies. Collection quests for boxers have you killing more mobs which translates into more gold.