Twilight Sparkle's imagination as a child was unbelievable, probably due to all those books. Which also make up the amazing Fort Book, Twilightopia's first stronghold against the country of Armor! With the help of Captain Smartypants and Private Cadence, General Twilight defends her fort against her brother's advancing army of one!
A tale of Twi's childhood told from her point of view.

Inspired by the cover picture.

Celestia had a problem. Somepony wrote a novel about Nightmare Moon's rebellion. This made Luna quite unhappy, and unfortunately for her sister, Luna has not yet gotten the hang of modern traditions like freedom of speech, the abolition of the death penalty, and not bothering Princess Celestia when she's trying to sleep.

Fortunately, Celestia also had a faithful student, one who is now a Princess with an ill-defined portfolio and perfectly capable of dispensing justice by the laws of both today and one thousand years ago.

Now Twilight Sparkle has a problem.

(Title image hacked together from vectors by Martinnus1, Hawk9mm, and Paulie15.)

Once upon a time, in the magical land of Equestria...

One week ago, Twilight Sparkle was crowned the fourth Princess of Equestria. Tonight, Ponyville hosts the 1003rd Summer Sun Celebration, and Princess Celestia and Princess Luna want a vacation. With two fine young princesses like Cadance and Twilight to take over for them, nothing could possibly go wrong.

(Title image hacked together from vectors by sakatagintoki117 and Chrome-MMVII.)

This story is a sequel to Hard Reset

After the events of Hard Reset Twilight's life and mental well being are slowly returning to normal. Her recovery is cut short, though, when a letter arrives informing her that the time loop spell she cast is causing severe damage to space and time itself. In over her head, Twilight tries to summon anypony who will know how to fix it. The pony she gets is the last one she ever thought she would meet... and nothing like she expected him to be.

Available in Spanish thanks to dgs1993
Series TV Tropes page

This story is a sequel to Petriculture

It's been several months since Pinkie Pie made a stunning admission about her past that permanently changed her relationship with her friends, particularly Twilight Sparkle, but life seems to have settled back to normal (well, normal by Pinkie Pie's standards, at least). However, when an old nemesis returns and ensnares Twilight in her influence, it's up to Pinkie to make things right.

This is the second story in The Petriculture Cycle. There is a TV Tropes Page for the entire Cycle here.

Cover image by Page Turner; "Princess Twilight" vector by Nianara.

Today is Princess Twilight Sparkle’s 500th birthday, and her most faithful student, an earth pony with a familiar name, can’t wait to celebrate!

Notes:
- Cover art by ErinKarsath, used with permission. Check out her DeviantArt page.
- This is a story in the Birthdayverse, and you can find the sequel here.
- Many thanks to my faithful Pre-Reader and all around super-duper best pony, Blood Lord. Go read his story, too!
- This was written during the season 3 hiatus of MLP:FiM.

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!)

The first time we danced, she broke my jaw in three places.

The life of a disposable minion in the service to the Dread Ahuizotl is filled with acts of senseless violence and hardship, normally ending in a hospital or unmarked grave, but for Disposable Minion #3, the job just got more interesting.

He fell in love.

And love hurts.

Credits to the amazing Luvlessi for the cover art
Background music: The Masochism Tango by Tom Lehrer
With a wonderful reading by Luvlessi
And a second reading by Crafty Reads
Featured on Equestria Daily

Three missing pieces, two loving alicorns, and a single stupid decision that will set young Princess Cadence on a fresh new course. Story One of the "Cadance of Cloudsdale" cycle.

Cadance of Cloudsdale (so far!) is serialized in Spanish! See here for the Spanish translation courtesy of SPANIARD KIWI!

Princess Celestia goes out on a whim for an ice cream cone and discovers just how shaky her own personal finances are, leading to a fiscal catastrophe that could threaten the status of the entire nation.
Featured on Equestria Daily with two stories by Bad Horse called Sisters

Now with readings from the Living Library Players and joehighlord.

Editing assistance by Bad Horse
And a review by Paul Asaran
And a Spanish translation by Kiwi.
And a Chinese translation by way of Nova Twinkle.