Excellent choice for a thread. I've been meaning to start a non-Groening fic recommendation thread to parallel Missy's one myself, but real life got in the way. I'll definitely have to check out "Sailor Nothing", it sounds very worthwhile.
You might want to sticky this thread, seeing how The Club has most traffic of the boards here.
Some Tolkien-related goodfics (yes, they do exist):
By author known as Philosopher at Large/Bellatrys. She has written many fics, these are the ones I've read and can testify to the goodness of.
Terrible Gifts"Silmarillion" darkfic. A nameless Elf in the company of King Finrod and Beren, all captured when attempting to go undercover into the land of the enemy, withstands torture in the dungeons of Morgoth. When his tormentor offers him a way out, what can prevent him from taking it? Not even close to the self-indulgent gore-fests that usually define the genre: in this dark world, the most important suffering and relief are mental. The author's essay about what went into writing this fic are
here, also providing some background for us whose "Silmarillion" memories are hazy.
And some shorter mood pieces:
Exultation of GoldVery short fic about the dragon Glaurung, the Golden.
Wise, Fearless and FairGaladriel's thoughts when Frodo offered her the One Ring.
Lord of CarrionThe Witch-King of Angmar confronts Éowyn on the battlefield.
Well, after this somewhat dark bunch, time for something lighter:
By various Tolkien fans:
The e-textSome of you have seen this already. Finally, "Lord of the Rings" is available to read online! Well, not really. There are some changes from the source material. But if you want to read about Sam's attempts to start a communist revolution in the Shire, about the One Ring of Seduction, about Arwen the Warrior Babe, and about the many deaths of Boromir (tm), then look no further. Watch out for the chapter where Maglor son of Fëanor appears and sings a condensed version of the plot of "The Silmarillion" to the tune of Simon & Garfunkel's "The Boxer".
Original fiction:
Some online short stories by Adam Cadre, whom I know mainly as the creator of such excellent text adventure games as "Photopia" and "Varicella". These two are about characters in his novel "Ready, OK" (which I have not yet been ready to find), the idiosyncratic Young family.
DecemberSeptember Young tells the story about his odd little sister, December.
A Winner Is YouJulie Young deals with adolescent life and has a run-in with a very ambitious boy.
I'll post more stuff here, I'm sure...
EDIT: Edited to explain that the LotR e-text is not the creation of bellatrys, and thanks Graham!