Primary

 Intelligence
 Strength
 Agility

Damage

 Physical Damage
 Elemental Damage
 Melee Damage
 Ranged Damage
 Fire Damage
 Ice Damage
 Light Damage
 Critical Damage
 Armor Penetration

Defensive

 Health
 Mana
 Armor
 Resistance
 Dodge
 Tenacity
 Life Steal
 Mana Steal
 Spell Vamp

Miscellaneous

 Move Speed
 Attack Speed
 Projectile Speed
 Cast Rate
 Jump Force
 Range
 Melee Range

Melee Damage

Melee Damage is the form of damage dealt by short ranged weapons. Melee Damage increases as  Strength increases, and is the preferred form of damage for the Warrior and Rogue.

Melee Damage is a subset of  Physical Damage, therefore Melee Damage caused by basic attacks benefits from  Life Steal and  Mana Steal. Melee Damage is countered by  Armor, which in turn is countered by  Armor Penetration.