I'm looking for,

Brütal Legend
The Cave
Scribblenauts Unlimited
Dawnguard and Dragonborn
New Vegas DLC's or Ultimate Edition
Doom 3 BFG Edition
Borderlands 2 Season Pass or single DLC's

I can offer a reasonable combination of these games below.

GOG
The Witcher 2
Interplay Bundle Tier 1 (VR Soccer 96, Kingdom: The Far Reaches, Evolva, Screamer, Shattered Steel, Jagged Alliance 2: Unfinished Business, MAX + MAX 2 and Conquest of the New World)

Origin
Sims Medieval

Steam
Darksiders II Abyssal Forge (code)
Darksiders II Rusanov's Axe (code)
Darksiders II Van Der Schmach (code)
Alan Wake American Nightmare (code)
GT Legends (code)
Red Faction Guerilla (gift)
Bloody Good Time (code)
Eufloria (gift)
Nexuiz Duel Mode DLC (gift)
Oil Rush (code)
New Star Soccer 5 (code)
SpaceChem (code)
Cortex Command (code)
Magicka (GG gift including Steam code)
Eschalon: Book 1 (code)
Ceville (code)
Men of War: Condemned Heroes (code)
Humble Frozen Synapse Bundle (code; Frozen Synapse, Trauma and SpaceChem)

Indie Gala 9 (full bundle) http://en.wikipedia.org/wiki/Indie_Gala#Indie_Gala_9

Gamersgate
AIM, AIM 2, A-Race Extreme Show, Alien Shooter Gold Pack, Cities in Motion, Cuban Missile Crisis, Cuban Missile Crisis Ice Crusade, Creature Conflict: The Cland Wars, Cannon Strike, Disciples 2 Gallean's Return, Desert Law, Death Track: Resurrection, Death to Spies Moment of Truth, Faces of War, Freight Tycoon, Hellforces, Hard Truck Apocalypse Rise of Clans, King's Bounty: The Legend, Korea: Forgotten Conflict, Konung 2, King of the Road, Legendary, Magicka, Mortyr 2093-1944, Off-Road Drive, Planet Alcatraz, Pacific Storm, RC Cars, Reign: Conflict on Nations, Renegade Ops, Real Warfare: 1242, Real Warfare 2: Northern Crusades, Snajper, Spells of Gold, Streets of Moscow, Space Rangers, Space Rangers 2, Stalingrad, The Stalin Subway, Star Wolves, Star Wolves 3: Civil War, Swashbucklers Blue vs Grey, Timothy, Gooka - The Mystery of Janatris, Theatre of War 2: Africa 1943, Theatre of War 2: Battle for Caen, Theatre of War 2: Battle for Caen Special Edition, Theatre of War 2: Centauro, Theatre of War 2: Kursk 1943, Theatre of War 3: Korea, The Stalin Subway: Red Veil, UAZ Racing 4x4, Vivisector: Beast Within, Whirlwind of Vietnam, World War I, XIII Century - Death of Glory and Zombie Shooter

All codes I had given away... no trades done... oh well... at least some people were happy with the outcome :P

updated

Games for Trade

Steam:

Keys:

Cargo! The Quest for Gravity
Crazy Machines Elements
Darwinia
Defcon
Eschalon Book 2
Galactic Arms Race
Gettysburg
Hearts of Iron 3
iBomber Defense Pacific
Multiwinia
Party of Sin
SpaceChem
Uplink

GamersGate:

Keys:

Gun Metal
Street Racing Syndicate

Desura:

Keys:

Fibrillation
Livalink
Major Mayhem
Talisman Prologue

Want:

Steam:
Baldur's Gate: Enhanced Edition
Conquest of Elysium 3
Depths of Peril
Disciples 2: Gallean's Return
Earth Defense Force: Insect Armageddon + DLC
Endless Space
Gratuitous Space Battles + DLC
Real Warfare 2: Northern Crusade
Sins of a Solar Empire: Rebellion
Stalker: Call of Pripyat
Velvet Assassin

GoG:
Neverwinter Nights 2 Complete
Omikron The Nomad Soul

Offers

Successfully traded with Adambiser and Accatone and Yayosucka :)

Have
steam gifts:
The First Templar - Steam Special Edition
PAYDAY™ The Heist
Men of War: Vietnam
Two Worlds II: Velvet Edition
The Whispered World
Amnesia: The Dark Descent
The Baconing
BioShock® 2

steam keys:
Humble Indie Bundle #1
Humble Indie Bundle #3
Shadowgrounds Survivor
Disciples II: Rise of The Elves
Star Wolves
UFO: Afterlight
King's Bounty: Armored Princess
Space Rangers
Crusader Kings II: Legacy of Rome
Crusader Kings II: Sword of Islam
Iron Brigade

GOG
ROA1-2, ROA3

Want
steam:
FTL
Dishonored
The Elder Scrolls V: Skyrim - Dawnguard
The Elder Scrolls V: Skyrim - Dragonborn
The Elder Scrolls V: Skyrim - Hearthfire
Don't Starve

GOG:
Syndicate Wars
System Shock 2

other offers

Have - Steam keys:
Vertex Dispenser
iBomber Defence Pacific
Galactic Arms Race
Gemini Rue
Snapshot
Fieldrunners
Superbrothers: Sword & Sworcery EP
Splice
Crayon Physics Deluxe

Want
Offers
Cognition Ep. 1 - Desura (it's in the new Bundle in a Box)
Just Cause 2 DLC (any) - each is -75% today on GamersGate


I'm willing to trade multiple games from the list for one.

PM'd you.
Dawn Star is currently a Desura key though (not yet Greenlit).

EDIT: Thank you for the easy trade!

Mainly looking for trades for GOG games (IR bundle being exception).
Note i am willing to trade multiple keys & consider other GOG games aside from those on my want list

{ Have }

Cat Lady (Desura)
Dukem Forever (Steamkey)
Hell Yeah! Wrath of the Dead Rabbit (Steamkey)
Machinarium (Steamgift)
Oddworld Abe's Oddysee + Exodus (Steamkey)
Sacred Gold (steamkey)
Vessel (Steamgift)
Victoria II (Steamkey)

{ Want }

Blade of Darkness (GOG)
Never Winters Night 2 Complete (GOG)
System Shock 2 (GOG)

Thanks Ian :-)

Update: I'm willing to trade two-for-one for Baldur's gate 1.

GOG only.

I would like: Balder's Gate 1
Temple of Elemental Evil
Heroes of Might and Magic 3


I am willing to trade: Arcanum: of Steamworks and Magic Obscura
Icewind Dale complete
Icewind Dale 2
Neverwinter Nights: Platinum
Lionheart: Legacy of the Crusader
Gothic 2

updated

EDIT: updated on:

http://www.gog.com/forum/general/classifieds/post5944

and thanks to Hezli and stoicsentry for nice and smooth trade!

ENDED, CODE WILL USED FOR MY FIRST GIVEAWAY

Have :

Borderlands 2 ( Steam key )
XCOM: Enemy Unknown ( Steam key )
Bioshock 1 ( Steam key )
Civilization V ( Steam key , no DLCs )

I'd like to receive

Neverwinter Nights 2: Complete for XCOM: Enemy Unknown

Clive Barker's Undying for Bioshock 1

Omikron: The Nomad Soul for Civilization V

System Shock™ 2 and Settlers 3®: Ultimate Collection for Borderlands 2

Offer expired!