WoW - Item Database @ Official Site
Taking the lead of many a fansite, Blizzard has added an item database to the official World of Warcraft site.
The Armory's Item Database is a comprehensive searchable database of the items of World of Warcraft. As the only official item database for World of Warcraft, it has the exclusive ability to draw information from the actual game servers and is integrated with the Armory's character profiles. It's also designed for ease of use – to give you the items you're looking for as quickly and easily as possible.