Twilight has a brand new theory. She has theorized that it is possible to create pocket dimensions and a way to enter them. Facing the ridicule of the rest of the theoretical magic community she has set forth to prove them wrong. She will construct a portal and enter it.

She does. Inside, she finds a field of empty white.

The story now has a dramatic reading by MrSnarky. Visit his channel on youtube.

Teleportation. It is the best possible way to travel... As long as you don't think about it too much. As long as you don't ask where Twilight goes in that split second when she's neither here nor there.

The sound I listened to as I wrote it, available to you in order to give you the option of having the same atmosphere.

No relation to the other story with the same name, just a coincidence of both picking the same excellent title. I was unaware that the other one existed.
Dramatic Reading by Charles Spratt | Second Reading by TheDizzyDan | Third Reading by Crafty Arts | Fourth Reading by Stormy787
Russian Translation 1 (by Aloz) | Russian Translation 2 (by Doof Ex Machina)

Most ponies assume that something is wrong with Ditzy Do's eyes. Theories range from a head injury to a genetic disorder to muscle damage behind her eye. The crueler folk suggest she's just retarded. Nicer ponies say it's just a party trick she never got tired of.

They're all wrong. They're all very, very wrong.

I discovered the truth one day in conversation with her. One eye would always look at me, and the other would wander. At least, I thought it was wandering. So while we were talking, I followed it. Goddess in heaven I wish I had not. Never follow the other eye. Ever. Because Ditzy Do's eyes work fine.

She's just watching something. That... thing that's always in the corner of our eyes. And if she looks at you with both eyes?

Goddess save you.

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Preread by BrastaAAura17, Chase Cosmicwing and dreamingnoctis. Cover art also by dreamingnoctis. Guy's a bro.

This story is a sequel to Stardust

Times are changing for Equestria as Twilight’s return brings with it news of people and cultures from beyond the peaceful world everypony knows. Aid and volunteers are freely offered to help the besieged humans of Earth because every Equestrian knows that’s what good friends do. Unfortunately, making friends can also have the unintended consequence of making enemies.

When the monsters besieging the humans strike at Equestria with a level of brutality not seen in over a thousand years, the cry for help is sent to all the kingdoms of the world. Honored allies step forth to fulfill ancient treaties and oaths. Enemies, old and new, bury their grievances. An alliance never before seen in Equestria will be created to combat the monsters from the void.

And because of these events, a grim but welcome sibling to the XCOM project is born.

(XCOM/FiM Crossover)
(Sequel to Stardust, which I recommend reading before starting this. Fortitude Amicitia and Broken aren't required reading but are supplemental to the storyline)
(Gore tag for blood and violence)
(Alternate Universe tag because of the divergence from canon that Stardust has caused)
(Uses elements of Season 4)
(Coverart produced by the amazing Carnelian!)
(Many thanks to Arzoo, BradTheBrony, Vandenbz and Setokaiva for prereading!)
(As of 03/07/2016, the prereading team consists of Arzoo, BradTheBrony, Noble Cause and Metallusionsismagic!)
(Complete with it's own TVTropes page as part of the Stardust continuity. Could use some updating!)
(Character tags will be added as chapters are added!)
(Featured 5/12/2014! Thanks folks!)
(Possible spoilers in the comments! BEWARE!)

This story is a sequel to The Luna Cypher

Twilight sets out to learn more of the ways of the world, and soon decides that the whole planet is disorganized, insanely dangerous, and desperately needs to be fixed. And she's just the mare to do it... with a little help from her friends.

Also, there are sky-pirates!

Book 3 of the Alicorn Adventure series.

A few extra, slice-o-life chapters are here: On the Rocks

Princess Twilight Sparkle discovers a centuries-old mystery hidden in the Royal Archives. Her investigation leads through layer after layer of deception and misdirection, setting her hooves on a path that seems to be leading to a mysterious secret. Along the way, she learns that some friendships can be very, very strange.

Book 1 of the Alicorn Adventure series.

AUDIOBOOK by VisualPony
Featured at the Royal Canterlot Library
TV Tropes Page (Courtesy of Sandtalon)
Goodreads Page (Courtesy of Facedeer)
Equestria Daily Page

WARNING: Major spoilers in the comments. Takes place several months after the end of season four. (Not a Da Vinci Code crossover, BTW!)

Do you see a dark tag? No, you don't. Not dark. Well, okay, there are a couple of dark-ish bits, but that's all. Not enough to warrant a tag. Speaking of tags, there really ought to be "Badass Twilight" and "Friendshipping" ones.

Sequels and side-stories (and more) can be found here Offprint and AO3, and a hardbound two-volume set of all that can be ordered from The Ministry of Image.

My editor for the first edition of this story was Gogito, and I can't thank him enough for all the hard work he did. My editor for the revised version was PresentPerfect, and he did a terrific job of getting the story into excellent shape.

The star system Omega Centauri was just another oddity on a map to scientists in the not too distant future. However when they found the star was orbiting an earth-sized, earth-like planet instead of a black hole as its motion had suggested, a mission was scrambled to investigate this most unusual of celestial behaviors.

Hamstrung by politics, and nearly crippled before it began, the 'Lone Ranger' mission was reduced to just one crew member and left to his own devices.

These are the logs of Arrow 18 and its lone commander. This information is classified TOP SECRET by the Global Space Agency.

Do NOT tell the princess.

"It has been the pivotal teaching of the great Fountainhead, personal mentor and Celestia's most esteemed archivist, that the grand unified theory of magic, if discovered, is to be found within the mage's affectivity –that is; of the polarizing impetus of love, for unicorn magic, and hate, for Black Magic. It is claimed, further, that reality itself, too, is subject to this principle; and to deny so was self-contradictory. The dogma, however was not uncontested. Unicorns, Mages and Archmages from all over Equestria of all emotional preconditions would challenge and confute the thesis with ease. It was here that the great Fountainhead replied that the grand unified principle was too profound to be felt and too minute to be perceivable. He posits that, though invisible, this maxim holds together the fabric of the universe: matter with magic; existence with consciousness; dreams with reality; and–most significant of all–ourselves with one another."

-Starswirl the Bearded, "Hermeneutical Phenomenology of Pre-Classical Metaphysics", Royal Canterlot Archives (323 L.B.), p. iii-iv

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EDIT 04/16/13: Remastered version coming soon! Grammatically sound, split into several chapters and improvised.

In the aftermath of her battle against Tirek, Twilight Sparkle is unwell. She wants more. She needs more. And she is afraid of what others might think of her.

But even in the midst of her growing despair that she has betrayed everything she stood for, she learns something about friendship and what it means to be an alicorn.

James Kaughn is a member of the world's most elite fighting force, but when his team is sent in to rescue a captive family in Afghanistan the mission hits a snag. He stays behind to allow the others to escape, fully expecting to die, but ends up in an unfamiliar place. Join him as he meets new challenges and struggles with his worsening PTSD. Will he be able to actually make friends and not just teammates?