UPDATED: 23.03.2009
If you have any infos about the loot of if you see any mistakes, late us know.

We'll try to keep track of most of the items that from from Ulduar Bosses. Remember that most of them don't have the loot added and everything can be changed in this PTR state. We will update this list along with wowhead.com updates so we can use their popups

Ulduar Items

General Vezax
Loot can be found to the dedicated topic of this boss here.

Iron Council
Loot can be found to the dedicated topic of this boss here.

Hodir (25)
Staff of Endless Winter - Staff
Drape of Icy Intent - Back
Frigid Strength of Hodir - Neck
Frozen Loop - Ring
Winter's Icy Embrace - Chest Leather
Frost-bound Chain Bracers - Wrist Mail
Frostplate Greaves - Legs Plate
Northern Barrier - Shield
Bindings of Winter Gale - Wrist Mail
Gloves of the Frozen Glade - Hands Leather

Hodir (10)
Icecore Staff - Staff
Signet of Winter - Ring
Avalanche - Bow
Shiver - Mace 1H
Ice Layered Barrier - Shield
The Boreal Guard - Shield
Bitter Cold Armguards - Wrist Plate
Winter's Frigid Embrace - Back
Cowl of Icy Breaths - Head Cloth

Ignis the Furnace Master
Loot can be found to the dedicated topic of this boss here.

Freya
Loot can be found to the dedicated topic of this boss here.

Kologarn
Loot can be found to the dedicated topic of this boss here.

Auriaya
Loot can be found to the dedicated topic of this boss here.

Flame Leviathan
Loot can be found to the dedicated topic of this boss here.

Algalon the Observer (Hard Mode only boss)
Greaves of the Stonewarder - Feet Plate
Handguards of Revitalization - Hands Plate
Legplates of the Endless Void - Legs Plate

XT-002 Deconstructor
Loot can be found to the dedicated topic of this boss here.

Razorscale
Loot can be found to the dedicated topic of this boss here.

All Bosses:
Fragment of Val'anyr - New Legendary Mace Piece

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Emblem of Conquest Items

Girdle of Unyielding Trust - Waist Plate
Shieldwarder Girdle - Waist Plate
Belt of the Singing Blade - Waist Plate
Legguards of the Peaceful Covenant - Legs Plate
Wyrmguard Legplates - Legs Plate
Legplates of the Violet Champion - Legs Plate
Gauntlets of Serene Blessing - Hands Plate
Gauntlets of the Royal Watch - Hands Plate
Bladebreaker Gauntlets - Hands Plate
Belt of the Ardent Marksman - Waist Mail
Windchill Binding - Waist Mail
Leggings of the Weary Mystic - Legs Mail
Leggings of the Tireless Sentry - Legs Mail
Gloves of Augury - Hands Mail
Gloves of Unerring Aim - Hands Mail
Belt of the Living Thicket - Waist Leather
Belt of the Twilight Assassin - Waist Leather
Wildstrider Legguards - Legs Leather
Leggings of Wavering Shadow - Legs Leather
Grips of the Secret Grove - Hands Leahter
Gloves of the Blind Stalker - Hands Leather
Sash of Potent Incantations - Waist Cloth
Legwraps of the Master Conjurer - Legs Cloth
Touch of the Occult - Hands Cloth
Frozen Tear of Elune - Neck
Evoker's Charm - Neck
Shard of the Crystal Forest - Neck
Broach of the Wailing Night - Neck
Spiked Battleguard Choker - Neck
Breastplate of the Wayward Conqueror - Token
Breastplate of the Wayward Protector - Token
Breastplate of the Wayward Vanquisher - Token
Crown of the Wayward Conqueror - Token
Crown of the Wayward Protector - Token
Crown of the Wayward Vanquisher - Token