Just about everybody who plays WoW has played one of these characters. Although they aren't the main choice of most PvPr's, with a good Death Knight PvP spec, they can provide a good amount of fun as a side character.Here are very good Blood, Frost and Unholy specs for your DK in Warcraft 6.1.
Druids are determined to preserve the natural balance of the world and they will kick the crap out of you if you mess around with it. These characters can shapeshift into a myriad of beasties that cause all kinds of problems, or just call down a storm to take care of business. Druids can fill any role depending on their spec and are strong in almost any situation as: