[Complete! With TVTropes apparently!]
Also, apparently, an animated trailer.

In a world of brass and steam, Twilight Sparkle had thought she had made a life-changing discovery with the invention of the telescope. For better or worse, she was correct.

Now her discovery has not only changed her life, but the lives of those she seeks out in her desperate attempt to contact the only other creature as lonely as Twilight herself.

It all would have been much simpler, but it had to be the one Twilight could only call The Mare on the Moon.

Decidedly not within walking distance, then.

[Featured on EQD before story was meant to be submitted. 4/03/2015]

[Editing team: Southpaw, Wolfvenom, Maskedferret, SwanSong and BluePaladin42, without whom this story would be a fraction of its current state.]
[Special thanks to Novel-Idea for the updated cover]

How much can change in a hundred years? How much can change in a thousand? The day of the Nightmare’s defeat Princess Luna finds herself adrift, a thousand years away from the world she knew. With her home in ruins and Equestria changed beyond all recognition, is there anything left for her when even apples are strange?

Winner of August's Write-off! - Distant Shores

With thanks to JCatt and Lord of Dorkness for their help pre-reading.

When I first met Princess Twilight, she was confused, lost. Adrift in an alien world. I thought of her as a rich eccentric, certainly a foreigner. I humored her as much as I believed her, really. Even when she dragged me to the very ends of the world in her mad quest for a mythic well, I really did it all for her. I figured it would help her find some closure, and we could go home.

I was right, in a way.

Based roughly on the game 80 Days.

Sunset Shimmer is having the worst day of her life. She used to be important. She was the personal student of Princess Celestia. She was a future leader of Equestria. She was the kind of mare that everypony envied.

Today, it's all crashing down around her.

Alternate Universe: What if Sunset Shimmer hadn't gone through the mirror?

When Twilight told the Princess that one of her long-time friends was actually a changeling drone, she expected shock, she expected questions, requests for proof.

She did not expect "Yes, I know. Was that all?"

Now with a dramatic reading by Alicentaur Br0ny!

...and another one by Voiceguy!

And a most impressively produced reading by obabscribbler!

(If you're just going to listen to one of them, pick the third one).

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Translated into Chinese (by Chelicera) can be found on FimTale.

The legends told of their return.

For over a decade Equestria has been beset by the dragons. Every year more villages vanish in flames, and the lonely cities stand as our last redoubt. Winter has gripped the world, and our hope is fading.

But the legends tell of another, a light in the darkness. The Dragonborn, a mythic warrior reborn with the power of the Voice, the only one who can stand against the dragons.

But when she appeared, she was not what we were expecting...

It is the day of the Summer Sun Celebration, and Princess Celestia is coming to Ponyville. Twilight Sparkle is overseeing preparations yet again, and has meticulously planned every last detail to ensure that everything is perfect for her mentor's arrival. Nothing is going to go wrong.

Except when the big day comes, Twilight has gotten four hours of sleep and Fluttershy is nowhere to be found. Pinkie Pie sets off after her with nothing but a dark coat and the voice of a chain-smoking stallion, and the Apples and the Carrots are at each other's throats while Rainbow Dash is attempting to fill in for Fluttershy.

As her plans collapse around her and Ponyville descends into chaos, Twilight Sparkle must focus on obtaining the one thing that can set everything right: the all-powerful, awe-inspiring magic of caffeine.

Six Star Equestria Daily Feature

Daring Do cannot believe her luck when she is asked to help explore the most ancient tomb known to ponykind. But terrible danger awaits her, for beneath the earth rests something beyond equine understanding.

Warning: comments contain ending spoilers.

TVTropes page.
Alternate ending by Duplex Fields.
Archived in the Pony Fiction Vault.
Reviews:
One Man's Pony Ramblings
Louder Yay
PresentPerfect
The Royal Guard
Cleverpun's Critique Corner
The Goodfic Bin

Blank Slate is the greatest thief of his generation. He has robbed countless nigh-impossible marks, and his talents as a master of disguise are beyond par - truly, nopony knows who he is.

And now he's preparing the greatest heist in mortal memory: the treasure vaults of the Princesses themselves.

But you have to get up pretty early in the morning to get one past the pony who defines when ‘early in the morning’ is…

Spoilers in the comments! Beware! Beware...

Audio Reading available - thank you ABagOVicodin
Czech Translation available - Thank you Keranis

Isolated from her friends and taken prisoner in the middle of a war, Twilight must deal with the very real dangers of being percieved as an enemy as well as the nightmares of her arrival on 'Earth'. Can she overcome her own fears and the fears of her captors? Will the wayward unicorn's assistance be a boon or a curse to the 'humans?' Most importantly, will she ever find her way home?

"In short, it's a story of friendship and plasma rifles, with the emphasis on the friendship. The characters are well written, the XCOM setting is fleshed out very well, and the story is compelling. If you love XCOM, you'll love the story, but even if you've never heard of it, it's more than worth giving the first 3 chapters a read.

There's excellent action later on, but the real strength lies in the collision between the friendly and naive world of Twilight Sparkle and the desperate world of humans fighting a losing war for survival and willing to do anything to turn the tide."

--Arzoo

(XCOM/FiM crossover)
(Cover art commissioned by a friend and created by the magnificent FoxInShadow!)
(Original cover art by the amazing Carnelian can be viewed here!)
(Gore tag for blood and some violence)
(Many thanks to the studius OminousTen, Arzoo, xXFluttershyForeverXx and finally Setokaiva for giving my rambles a once-over)
(Now with it's own TV Tropes page! Get to tropin' folks!)