Barbarian Skill list completed and confirmed at Blizzcon 2008. (Diablo Wiki)

Barbarian’s skill trees are broken down into Berserker Skills, Juggernaut Skills, and Battlemaster Skills.

Berserker Skills

• Frenzy Deals 120% weapon damage and increases attack speed by X% for X seconds. Consecutive hits increase attack speed bonus to X%.
• Threatening Shout A shout that reduces the damage done by enemies within X feet by X% for X seconds.
• Onslaught Increases attack speed by X% and drains X Fury per second. Lasts until all Fury is drained or X seconds have elapsed.
• Double Strike Gives X% chance to swing with both weapons on every melee attack.
• Strong Constitution Automatically regenerates X health per second.
• Berserker State Increases the duration of Frenzy and Onslaught by X seconds.
• Leap Attack A mighty leap dealing X damage to all nearby enemies when landing.
  
• Enrage Enter a reckless rage, increasing Fury gained by X%, but also damage taken by X%.
• Dual Wield Specialization Increases the physical damage dealt with weapons while dual wielding by X%.
• Savage Increases Fury regeneration by X% for X seconds whenever you score a critical hit.
• Speed Boost Frenzy and Onslaught also increase your movement speed by X%.
• Whirlwind Spinning attack that demolishes any enemy in the Barbarian’s path.
  
• Slashing Strike Your melee attacks have a X% chance to hit all nearby enemies.
• Relentless Attacks Increases the damage of Frenzy and Whirlwind by X%.
• Destroy Armor Reduces enemy’s armor.

Juggernaut Skills

• Bash Bash your enemy dealing XXX% of your weapon damage.
• Cleave Cleave is a slashing melee strike that can hit multiple targets at once, dealing XXX% normal damage. It leaves a streak of bright red light behind when used.
  
• Ground Stomp Ground Stomp is foot-stomping skill that stuns and knocks back monsters in a small radius around the barbarian. It has a cooldown, preventing the player from repeatedly using the skill if/when the affected monsters become unstunned. While stunned, stars are shown spinning around their heads, and their defense is lowered and monsters that carry shields will drop them, making them very easy prey for the Barbarian’s other attacks.
  
• Focused Strength Increases the effect of Strength on your physical attacks.
• Stubborn Reduces all slowing effects by X%.
• Recovery Increases the amount of health gained from globes by X%.
• Taunt Causes nearby monsters to attack you.
• Stunning Blows Grants all Juggernaut Skills a X% chance to stun enemies for X seconds.
• Two-Handed Weapon Specialization Increases your physical damage dealt with two-handed weapons by X%.
• Invigorated Picking up a health globe increases your Strength by X% for X seconds.
• Seismic Slam It deals XXX% of your weapon damage to anything directly in front of the barbarian for a fair distance; nearly to the edge of the screen. Multiple monsters can be hit by each use.
  
• Revenge Smash the ground dealing XXX% of your weapon damage to nearby enemies. You gain X% of maximum health for each enemy hit. (Note: Revenge has a X% chance to be usable when hit by an enemy)
• Iron Will Provides resistance to stun, slow, and freeze attacks.
• Crushing Blows Increases the damage of Bash and Cleave.
• seismic Effect Increases the damage of Revenge and Seismic Slam.

Battlemaster Skills

• Battle Rage Enter a rage that increases your damage by XXX% and increases your critical hit damage by XX% for X seconds.
• Perseverance Increases the duration of Battle Rage, Battle Cry, and Ignore Pain by X%.
• Power of the Battlemaster Increases the damage of all Battlemaster Skills by X%.
• Iron Skin Toughens the Barbarian’s skin, increasing armor by X%.
• Hammer of the Ancients The Hammer of the Ancients is a massive damage attack that causes a giant golden mace to appear above the Barbarian, which he slams straight down into the ground in front of him, where the mace remains crushed for a moment. The attack deals XXX% of your weapon damage plus additional physical damage.
• Battle Cry The Battle Cry is basically Shout, from Diablo II. It increases the defense of the Barbarian and any party members in range. The defense and duration increase with additional skill points. It is a buff skill that uses Stamina. It is the first skill that is used by the Barbarian in the Diablo III gameplay video. Its use has shown us that any skill that buffs up the character is shown in the lower-left side of the screen in the form of a small icon.
• Scavenge Increases your chance of getting a health globe from slain monsters by X%.
• Critical Attacks Increases the damage bonus of your critical hits by XX%.
• Shield Specialization Increases your chance to block with a shield by X% and the amount of damage blocked by X.
• Furious Charge Furious Charge is a dashing attack that works almost like teleportation. The Barbarian targets an enemy and charges toward it at a very high rate of speed. He deals XX% weapon damage to all enemies he passes through on the way, and deals XXX% damage to the targeted enemy.
• Ignore Pain Reduces all damage taken by X% for X seconds.
• Deliberate Defense Your critical hits increase your armor by X% for X seconds.
• Improved Battle Rage Your melee attacks have a X% chance to make Battle Rage cost no Fury for X seconds.
• Death Proof Upon receiving fatal damage, the Barbarian is kept alive and gains XX% of maximum health. This effect cannot occur more than once every XXX seconds.
• Inspiring Presence Increases the effect of Battle Cry and Threatening Shout.
• Natural Resistance Increases all resistances by +10.
• Mighty Hammer Increases the damage of Hammer of the Ancients.