I’ve been poking around gear rewards from the various factions recently as a good way to get a little more geared up before I hit up those heroics that by all accounts, are no walk in the park. Reputation rewards are a good way to avoid the grind with stressful, drama-filled PuGs and they provide some great gear before you jump into more challenging content. Here’s my shopping list on gear from reputation rewards:
Guardians of Hyjal:
Easily get to revered by simply completing all the quests in Mount Hyjal. Provisioner Whitecloud can be found in the Nordrassil Inn, Mount Hyjal.
Cloak of the Dryads (Honoured) – Back
Aessina-Blessed Gloves (Revered) – Hands
Arcanum of Hyjal (Revered)
Wildhammer Clan (Alliance only):
Completing most of the quests in Twilight Highlands gets you to friendly and opens up five dailies.
Quartermaster Craw Macgraw can be found in Thundermar, Twilight Highlands.
Mantle of Wild Feathers (Honoured) – Shoulders
Belt of the Untamed (Exalted) – Waist
Lightning Flash Pendant (Exalted) – Neck
Dragonmaw Clan (Horde only):
Grot Deathblow, the quartermaster can be found in Twilight Highlands. Unfortunately I haven’t yet played the horde side in Cataclysm to know more but I assume there would be dailies just as the Alliance equivalent.
Spaulders of the Endless Plains (Honoured) – Shoulders
Withered Dream Belt (Exalted) -Waist
Yellow Smoke Pendant (Exalted) – Neck
Earthen Ring:
Completing quests in Twilight Highlands, Vash’jir and Deepholm grants substantial reputation. Provisioner Arok is in Silver Tide Hollow (Shimmering Expanse).
Pendant of Elemental Balance (Honoured) – Neck
Cloak of Ancient Wisdom (Revered) – Back
Leggings of Clutching Roots (Revered) – Legs
Ramkahen:
There is one daily available for this faction. Blacksmith Abasi can be found in Ramkahen, Uldum.
Ammunae’s Blessing (Honoured) – Ring
There really isn’t much more in gear rewards but I know I will be getting exalted with them for the camel mounts =)
Therazane:
Completing the quest chain in Deepholm opens up this faction and the daily quests. D’lom the Collector resides in Therazane’s Throne in Deepholm.
Diamant’s Ring of Temperance (Revered) – Ring
Greater Inscription of Charged Lodestone (Exalted)
Baradin’s Wardens:
A faction in Tol Barad. Even though it is a pvp zone, they have great rep rewards for PvE players. They offer numerous dailies which are somewhat difficult to complete considering you can’t fly in that zone. It might be worth your while just to grab the tabard for this one or bring along a buddy for the dailies. Note that you cannot obtain the tabard until honoured.
Shimmering Morningstar (Revered) – One-handed mace
Insidious Staff (Revered) – Staff (lacks Spirit but is not a bad option)
Mandala of Stirring Patterns (Exalted) – Trinket
Heals n Heels 
What about Tol Barad rep? I recall there being a nice trinket…
Thanks for pointing that out! The post is now updated with Tol barad reputation information =)
Diamant's Ring of Temperance (Honoured) – Ring;
Is the ring not awarded at Revered?
In any case, wonderful guide, has made gathering all my items and getting into HCs much, much easier, thanks!
Thanks for catching that! It is indeed at Revered and not Honoured. The post is now updated with the correction. I'm glad you found the guide useful =)
You may also want to include the lower-level shoulder enchant from Therazane, available at Honoured, Lesser Inscription of Charged Lodestone, which is great because you can get it very easily: http://www.wowhead.com/item=62342
there's 2 dailies for Ramkahen…. once you quest out most of the zone, the second one will show up