Argent Crusade Reputation Guide (Wrath of the Lich King)
The Argent Crusade faction consists of Paladins that made their home on Northrend. The main hub of The Argent Crusade is in Icecrown, right near the border of Crystalsong Forest. You can raise The Argent Crusade faction one of two ways, do the dailies in Icecrown or wear the Argent Crusade tabard while running a level 80 instance. Since level 80 instances are much easier now, I can solidly recommend farming Reputation that way.
I prefer Halls of Stone (I only clear the trash and easy bosses, I stop at the escort) or Halls of Lightning. The Argent Crusade doesn't have many dailies available to them that are worth doing. So this would be a wise faction to wear the Tabard for.
The Argent Crusade faction can be raised by doing dailies and wearing their tabard in instances. Very similar to the Shattered Sun Offensive reputation you can also raise your Argent Crusade reputation with gold. For a link to the quest you can raise your reputation with via gold click here. Below is a list of the only Argent Crusade daily worth doing (In my opinion)
Slaves to Saronite
You can get this quest from Absalan the Pious aboard the Skybreaker for Alliance and Brother Keltan aboard Ogrim's Hammer for Horde. For this quest you are required to head over to Ymirheim and enter the large ass cave. In here you will need to talk to the miners until 10 of them are freed.
Argent Crusade Reputation Achievements
Argent Dawn Reputation Guide
Argent Crusade Reputation Guide