What's your favorite quest line in the game?

There are quite a few good ones, but hands down my favorite is the Fordring line. What a great series of quests that are, unfortunately, mired down by 3 very lame prerequisites. Definitely worth doing though if you like to get into quest stories.

Here's the opening text to that line:

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Sit and listen to my story, undead.

>>I am ready to hear your tale, Tirion.

I must apologize for not being entirely truthful with you in regards to
my identity. I had to be certain that you could be trusted - few
people would have selflessly lent assistance to an old and forgotten
hermit.

You have proven yourself as one of those people: A person of integrity and honor.

>>Thank you, Tirion. What of your identity?

My son, Taelan, was only a child when I was found guilty of treason
and banished from the Alliance to live a life in exile. I chose to
remain here so that I could watch over him; to somehow insure that he
would group up an honorable man.

As I had hoped, he took my place as lord of Mardenholde; but in a
cruel twist of fate, joined the ranks of the Scarlet Crusade. He is
now their Highlord, undead.

>>That is terrible.

Indeed. The Scarlet Crusade are an aberration of the Order of the Silver Hand.

You must believe me, undead; Taelan is a good man. He needs
guidance. He needs to remember... remember what it is to be noble and
honorable. I know that in his heart, he knows what he does is wrong.
Will you help him? Will you help him remember?

>>I will, Tirion.