A lot of things changed for the Death Knight class in patch 3.1, especially for tanks. Here are the new cookie cutter tanking specs for all three Death Knight talent trees, plus a bonus one that you may never have seen before but is incredibly effective.
Apart from being a tool to tell you what a given player is wearing, the WoW Armory can give you a wealth of information on equipment, reputation factions, guilds, achievements and a host of other useful information.
Showing what is included in each of the dungeon armor sets for the Druid class in World of Warcraft, this will also have links to futher in depth articles on each set.