ArkInventory
Allows viewing of your (and your alts) Bags, Keyring, Bank, Guild Bank, Inventory and Mail items.
Cataclysm 
Mists of Pandaria 
The Burning Crusade 
Wrath of the Lich King Addon Details
Expansion
Categories
Developers
Having issues?
ArkInventory is a WotLK addon for patch 3.3.5a that provides better functionality to your bags and inventory.
Features:
user-configurable window width and height
separate keybindings for each location for easy viewing
assign items to a category of your choice (overrides the default assignment)
assign categories to the bar of your choice
unlimited number of bars (there are practical limits though before your screen becomes full)
sort each bar differently if required
user-configurable bars per row
Download ArkInventory
Cataclysm
4.3.4
More addons for Cataclysm
Discover other addons that might interest you
XLoot
A remake of the built-in lootframe.
PhanxBuffs
Basic replacement for player buff, debuff, and temporary enchant frames.
Hagakure Cooldowns
Draw cooldown's interface
MoonTime
MoonTime - addon for moonkin cast timing
pNameplates
Lightweight nameplate replacement that is more than just the bare minimum
KC_Trashman
A simple, zero config, trash item seller
ElvUI
User Interface replacement AddOn for World of Warcraft.
Grid
A modular, lightweight, and screen-estate saving grid of party/raid unit frames.