So, a string of my guts isn't usable for anything?
SPOILER
I believe it can be used to make the Intenstinal Phylacretry (SP?), a very good bracelet.
Actually, the original intestines removed by Marta in the buried village can only be given to Ignus for the Elemental Shield spell.
If Marta removed the Nameless One's intestines before, Ravel could remove another set of intestines (which the Nameless One presumably regenerates) to create the Intestinal Phylactery.
As for the portal keys let's see how well Quiet Lurker remembers things
:
1k). Crooked Finger Bone (of Vaxis' corpse) or Finger Bone Charm
1p). Portal leading out of the Mortuary
*Portal to the Mausoleum is quest activated
2k). Piece of Junk (Essential but not unique key)
2p). Portal leading to the Buried Village
3k). Vlask's Portal Key (Buy it or take it from his corpse)
3p). Only way out of the doorless house in the Ragpicker's Square
4k). Cranium Rat Tail
4p). Not-so-secret treasure room in the Trash Warrens
5k). 4 x Tomb Keys (found in Tomb of the Nameless One)
5p). Only way to get around the tomb
6k). Modron Cube (buy from Vrischika's Curiosity Shop)
6p). Get to Modron Maze from Sigil
6k). Portal Gem (Found as random treasure in Modron Maze or on Evil Wizard's corpse)
6p). Transport from the Modron Maze to any of the main Sigil Wards
*Portal to the Siege Tower can be activated only after talking to Lazlo in the Market
7k). Lady of Pain Doll (buy from Vrischika's Curiosity Shop) - Useable only once if you are not one of Aoskar's disciples Not exactly a key but it acts that way.
7p). Player's Maze
8k). Folding Portal (Plot Item)
8p). Ravel's Maze
9k). Ravel's hair (obtain through conversation)
9p). Ravel's sanctum. Where you can make Black Barbed Wands from the seeds.
*Portal to Curst Prison is quest activated (there is no material "five part key")
*Portal out of Curst Prison is quest activated (there is no broken chain link)
*Portal to Baator is quest activated after talking to Fjhull
*Portal out of Baator is trigger activated (there is no actual implemented piece of obsidian as far as I know)
*Portal to Carceri is trigger activated (Just walk under the gateway)
*Portal out of Carceri is trigger activated (Defeat Trias the Betrayer)
10k). Skin of Regrets
10p). Get to Fortress of Regrets from Mortuary
*Portal to crystal chamber is triggered by the war-machines
*Deionarra takes you to the last area where the Transcent One awaits.
As you can see, most of the portals in the later game don't have keys.
There are also more keys if you activate the candlestick quest.
Am I missing anything?