(This is by no means a complete list, but it covers the basics. We will be adding to it regularly. This list was compiled by the Pit.)
Mortuary scrolls -- get them from
the Giant Skeletons on the first floor
Penn's note -- get this at the Open Tomb in the NE Hive
Angyar's contract -- with Mortai in the GDB
Tattoos -- buy at the Tattoo Parlor in the SE Hive
Your Eye -- Barkis at the SCB has your eye for sale
Charm of Infinite Recall -- the first one you find is in a crate in the Alley of Dangerous Angles
Rauk's rings -- one in each of the three tents in the Alley of D.A.
Porphiron's beads -- red and black thugs outside of the SCB to the left
Nestor's fork -- One-Ear has it over to the west of the Flophouse
Remove curse scroll -- Mebbeth has one in the Ragpicker's Square and you can also buy one at the Civic Festhall in the Clerk's Ward (from Splinter)
Portal junk -- can be found in the building in the middle of the Ragpicker's Square
+2AC Amber Earrings -- Mebbeth will give you these when you finish mage training in Ragpicker's Square
Finger bone -- a guy called Marrow-Friend has it outside the building with the junk in Ragpicker's Square
Bronze Sphere -- in the Drowned Nations
Your Intestines -- Marta the Seamstress in the Buried Village will rip them out of you if you like and you get a nice ring
Venom Tooth -- Marta will sell this to you after she rips your intestines out.
Uhir's Knife -- the Knifed Ghoul has it in the Dead Nations
Chad -- in the Weeping Stones Catacombs laying right near the door to the Dead Nations
Magic Sledgehammer -- in the Mosaic Crypt
Your Severed Arm -- in the Crypt of Dismemberment
Necklace of Hollow Teeth -- The necklace is found right outside Marta's house in a refuse pile, coordinates 1049, 1680 if you hit "L" on the keyboard for location. You do not need to talk to Gris first to obtain this. (credits to Gary Strand!)
Punch Daggers of Moorin -- in the Shattered Crypt
Punch Daggers of Zar-Anun -- get this from Lenny in the Lower Ward
Important skulls -- the Silent King, Stale Mary, Soego, Mantouk , and Hargrimm all have skulls
Decanter of Endless Water -- in the Drowned Nations
Bottle of Murk -- in the Warrens of Endless Thought
Tenement Key -- the mage on the third floor has it
Hammer and prybar -- hammer is near the dabus in the Alley of L.S., and an extra prybar can be found in the Tenement of Thugs, in a chest
Shards of Fate -- you can buy them at the Pawn Shop in the Lower Ward
Coffin Pillow -- get it at the Coffin Maker
Grimoire of Pestilential Thought -- get it from Mantouk below Lothar's building
Ring of Fallen Stars -- get it in the Underground Curst
Vial of Skin and Blood -- you can get this at the Apothecary in the Clerk's Ward
Birdcage -- get this at the Seige Tower
Dodecahedron -- your journal can be found in your Old Chambers in the Civic Festhall.
The Justifier -- you can claim this at the Foundry if you pickpocket the clerk for a new receipt
Frost Ale Mug -- you can get this from the drunken mage on the west side of Clerk's Ward
Dark Bird -- this river styx ice can be found in the Art Gallery
Deva's Tears -- you can buy this at the Curiosity Shoppe in the Clerk's Ward
Fiend's Tongue -- you can buy this at the Curiosity Shoppe in the Clerk's Ward
Potion of Horrific Splitting -- you can buy this at the Curiosity Shoppe in the Clerk's Ward
Teeth of the Fire Drake -- you can buy this at the Curiosity Shoppe in the Clerk's Ward
The Curiosity Shoppe has tons of good stuff (hint, hint)
Magic Sledgehammer -- you can get this at the campsite in the Player's Maze
Bone-Framed Journal -- you can get this at the campsite in the Player's Maze
Frosty Mint Candy & Minosaurian Chocolate -- you can find this in the upstairs part of the Traitor's Gate Tavern.
+2 Displacer Rings -- you can find these in various places, including the north section of Inner Curst.
Greater Dustman Embalming Charm & Serpent Ring -- you can find this in a box in Curst.
Scent of the Storm -- you can find this in a crate in the west area of Inner Curst.
Ring of Fallen Stars -- you can find this in Underground Curst.
Scroll of Call Lightning -- you can find this in the Prison.
Dread Bond Bracelet -- you can find this in the Prison.
Kasseg the Cerebral Parasite -- you can find this at Fhjull's in the Outlands.
Gordion Knot -- you can find this at Fhjull's in the Outlands.
Hatred's Gift -- you can find this at Fhjull's in the Outlands.
Fhjull has tons of good stuff (hint, hint)
Rod of Modron Might -- found in the Modron Maze.
Heartgrinder -- You get this from the fiend that you set loose in the grain silo in Curst. You have to ask for a reward.
Axe of the Jester -- Found in a locked and booby-trapped chest in Crumplepunch's house.
Oculars -- You can find various oculars in the Modron Maze. Only Nordom can use them.
Spiked Gauntlets of Ogre Power -- found in the Seige Tower.
Dreambuilder Birdcage -- found in the Seige Tower.
Blade of the Immortal -- found in the Seige Tower.
Celestial Fire -- you get this from Trias in the Prison -- or in Carceri if you didn't get it in the Prison.
Wish Spell -- It is in the warehouse with Ebb Creakness in Carceri. It is to the left of the door, hidden in some junk at coordinates X391, Y289(thanks Timmy O'Toole!)