Bukkit

List of Enchants:

ARROW_DAMAGE
Provides extra damage when shooting arrows from bows
ARROW_FIRE
Sets entities on fire when hit by arrows shot from a bow
ARROW_INFINITE
Provides infinite arrows when shooting a bow
ARROW_KNOCKBACK
Provides a knockback when an entity is hit by an arrow from a bow
DAMAGE_ALL
Increases damage against all targets
DAMAGE_ARTHROPODS
Increases damage against arthropod targets
DAMAGE_UNDEAD
Increases damage against undead targets
DEPTH_STRIDER
Increases walking speed while in water
DIG_SPEED
Increases the rate at which you mine/dig
DURABILITY
Decreases the rate at which a tool looses durability
FIRE_ASPECT
When attacking a target, has a chance to set them on fire
KNOCKBACK
All damage to other targets will knock them back when hit
LOOT_BONUS_BLOCKS
Provides a chance of gaining extra loot when destroying blocks
LOOT_BONUS_MOBS
Provides a chance of gaining extra loot when killing monsters
LUCK
Decreases odds of catching worthless junk
LURE
Increases rate of fish biting your hook
OXYGEN
Decreases the rate of air loss whilst underwater
PROTECTION_ENVIRONMENTAL
Provides protection against environmental damage
PROTECTION_EXPLOSIONS
Provides protection against explosive damage
PROTECTION_FALL
Provides protection against fall damage
PROTECTION_FIRE
Provides protection against fire damage
PROTECTION_PROJECTILE
Provides protection against projectile damage
SILK_TOUCH
Allows blocks to drop themselves instead of fragments (for example, stone instead of cobblestone)
THORNS
Damages the attacker
WATER_WORKER
Increases the speed at which a player may mine underwater

1.9 Enchants:
FROST_WALKER
Freezes any still water adjacent to ice / frost which player is walking on
MENDING
Allows mending the item using experience orbs