Apr 22nd 2007 3:14AM @ 17: "Hybrid" in WoW doesn't mean that they can do DPS as well as something else, it merely means that they can fill a certain raid slot. According to blizzard the warrior is a tank/DPS hybrid. While their primary role is to tank, a fury/arms warrior could take a melee dps slot over a combat swords rogue.
Much the same way that paladins are healing/tank hybrids. Though their primary role is to heal in a raid situation, if specced and geared for prot., a paladin can raid tank.
There are pure classes: Mage, Warlock, Rogue, Hunter. Every other class in the game is a hybrid. Shaman are DPS/Healing, Priests are heal/dps, warriors and paladins are described above, and druids are tank/heal hybrids.