Bukkit

Whistle:
Function - With the Whistle you can right click with it and set a warp to return to later. Right clicking with it will bring up a GUI asking you to set a warp or travel to one

Crafting -

Book of Knowledge
Function - None, as of now. Will be used to level up skills without having to do any work.

Crafting - Cannot be crafted, found in dungeons and perhaps other methods.

Chain Link:
Function - Used to craft chain armor

Crafting -

Orcen Bow:
Function - None, as of now, will be used to be a "buff" weapon. Buffs can be assigned to a Race and will only work with that race. Any other race can use them but they will not be nearly as powerful.

Crafting -

Bomb:
Function - Can be thrown to cause a delayed explosion (Bugged at the moment, I know)

Crafting -

Elixir:
Function - None, as of now, will be used to be a potion to heal you completely and restore all Mana

Crafting - Not yet implemented

Elven Bow:
Function - None, as of now, will be used to be another "buff" that can be assigned to a race.

Crafting -

Emerald Block:
Function - Building, storage for emeralds

Crafting -

(Imagine Ender pearls are emeralds)

Emerald Item:
Function - Can be used to make Emerald Blocks and craft magic wands (once Spout allows custom tools, weapons, etc).

Crafting - Can be obtained from Mining emerald ore.

Book of Endowment:
Function - None, as of now but it will be to level up a random ability a random amount of tiers

Crafting - Can be obtained via dungeons

Book of Magic:
Function - None, as of now but it will be to learn a new spell

Crafting - To be determined

Mana Potion:
Function - Restores Mana

Crafting - Not yet implemented

Poison Arrow:
Function - Waiting on Spout's entity API, could be a while :/

Crafting - Not yet implemented

So there you have it, still much to do but maybe you have a better idea now :)