Critical Hit Bonuses

There are a variety of Skills and Runestone Effects that rely on Critical Hits to trigger certain bonus effects.

Also See:
Increase Critical Hit Chance
Increase Critical Hit Damage

The Following Is A List Of Each Class' Skills and Runestone Effects That Rely On Critical Hits.
 

Barbarian Skill Effects Triggered By Critical Hits

Cleave (Scattering Blast)
Battle Rage (Into the Fray)
Battle Rage (Ferocity)
Battle Rage (Swords to Ploughshares)
Whirlwind (Blood Funnel)

Demon Hunter Skill Effects Triggered By Critical Hits

Hungering Arrow (Spray of Teeth)
Impale (Grievous Wounds)
Elemental Arrow (Lightning Bolts)
Night Stalker (Passive Skill)

Monk Skill Effects Triggered By Critical Hits

Fists of Thunder (Quickening)
Deadly Reach (Strike from Beyond)
Crippling Wave (Rising Tide)
Way of the Hundred Fists (Blazing Fists)
Wave of Light (Blinding Light)

Wizard Skill Effects Triggered By Critical Hits

Spectral Blade (Healing Blades)
Storm Armor (Shocking Aspect)
Electrocute (Forked Lightning)
Meteor (Liquify)
Critical Mass (Passive Skill)

Follower Skill Effects Triggered By Critical Hits

Scoundrel (Hysteria)