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Guild Perk and effect
Bartering: Reduces the price of items from all vendors by 5/10%.
Bountiful Bags: Increases the quantity of materials gained from Mining, Skinning, Herbalism, and Disenchanting by 15%.
Cash Flow: Each time you loot money from an enemy, an extra 5/10% money is generated and deposited directly into your guild bank.
Chug-A-Lug: The duration of buffs from all guild cauldrons and feasts is increased by 50/100%.
Everyone's A Hero: Increases Heroism points gained by 5/10%.
Fast Track: Experience gained from killing monsters and completing quests increased by 5/10%.
Guild Mail: In-game mail sent between guild members now arrives instantly.
Hasty Hearth: Reduces the cooldown on your Hearthstone by 15 minutes.
Have Group, Will Travel: Summons all raid or party members to the caster's current location. 2 hour cooldown.
Honorable Mention: Increases Honor points gained by 5/10%.
Mass Resurrection: Brings all dead party and raid members back to life with 35 health and 35 mana. Cannot be cast when in combat. No cooldown.
Mobile Banking: Summons your guild bank. 1 hour cooldown.
Mount Up: Increases speed while mounted by 5%. Not active in Battlegrounds or Arenas.
Mr. Popularity: Reputation gained from killing monsters and completing quests increased by 5/10%.
Reinforce: Items take 5/10% less durability loss when you die.
The Quick and the Dead: Increases health and mana gained when resurrected by a guild member by 50% and increases movement speed while dead by 100%. Does not function in combat or while in a Battleground or Arena.
Working Overtime: Increases the chance to gain a skill increase on tradeskills by 10%.
Perks for guild memners in cata as of now, prolly bound to change

Original post:
http://www.wowhead.com/guide=cataclysm&guilds#