I just took these from my bookmarks, they are are a majority of the quests offered in Wrath of the Lich King that provide "blue items" for completion. Most of them require a dungeon run (d), there is a couple of group quests (g) and a few of them require some prerequisite quests (c) a couple of long quest chains (ccc) but mostly they are easy simple quests with big and helpful rewards to leveling in Northrend.

*These were done on alliance a couple of them might not be available to horde.

68d - Disarmament - Quest - World of Warcraft

68d - Have They No Shame? - Quest - World of Warcraft

68c - Last Rites - Quest - World of Warcraft

69dd - Postponing the Inevitable - Quest - World of Warcraft

69ddc - Prisoner of War - Quest - World of Warcraft

69d - Quickening - Quest - World of Warcraft

69e - Get Me Outa Here! - Quest - World of Warcraft

71c - Frostmourne Cavern - Quest - World of Warcraft

71cc - The Battle For The Undercity - Quest - World of Warcraft

72c - Search and Rescue - Quest - World of Warcraft

72d - Don't Forget the Eggs! - Quest - World of Warcraft

72d - Head Games - Quest - World of Warcraft

72dd - Death to the Traitor King - Quest - World of Warcraft

73d - Cleansing Drak'Tharon - Quest - World of Warcraft

73d - The Faceless Ones - Quest - World of Warcraft

73g - Hour of the Worg - Quest - World of Warcraft

73g - Ursoc, the Bear God - Quest - World of Warcraft

74d - For Posterity - Quest - World of Warcraft

74g - Wanted: Ragemane's Flipper - Quest - World of Warcraft

74cc - Betrayal - Quest - World of Warcraft

74c - The Storm King's Vengeance - Quest - World of Warcraft

74d+c Gal'darah Must Pay - Quest - World of Warcraft

74g - Convocation at Zol'Heb - Quest - World of Warcraft

75d - Containment - Quest - World of Warcraft

75g - The Champion of Anguish - Quest - World of Warcraft

76D Halls of Stone - Quest - World of Warcraft

76c Post-partum Aggression - Quest - World of Warcraft

76cg - A Hero's Burden - Quest - World of Warcraft

77cg - Sirana Iceshriek - Quest - World of Warcraft

77c - The Last Line Of Defense - Quest - World of Warcraft

77c - The Crusaders' Pinnacle - Quest - World of Warcraft

77ccc - The Iron Colossus - Quest - World of Warcraft

77cc - The Reckoning - Quest - World of Warcraft

77c - Basic Chemistry - Quest - World of Warcraft

77g - Mind Tricks - Quest - World of Warcraft

77ccc - Battle at Valhalas: Final Challenge - Quest - World of Warcraft

77g - No Rest For The Wicked - Quest - World of Warcraft

77 part1 OC- The Struggle Persists - Quest - World of Warcraft

77-part2-OC A Wing and a Prayer - Quest - World of Warcraft

78 - A Royal Escort - Quest - World of Warcraft

78d- Junk in My Trunk - Quest - World of Warcraft

78d Vengeance Be Mine! - Quest - World of Warcraft

HOHOHO. Very sweet work there Usul!!! Sticky this...somewhere..

EDIT: May I add Usul, that the Ursoc the Bear God quest is the end of a quite long chain quest. Would be a cccg I guess