A vicious cloud of Hatred threatens Equestria, and only Celestia's greatest General, Twilight Sparkle, can put an end to it. Just a random story that was stuck in my head. It's nothing special, but go ahead and read it. And leave me some feedback. :D (i have no idea how this got to be so popular...)
WARNING: COMMENTS CONTAIN SPOILERS!!!

Twilight Sparkle has a lot of difficulty getting a good night's sleep. She has to keep it a secret from the ponies who care about her, because they might disown her. Worse, they might try to help...

WARNING: The first five or so chapters are, on reflection, properly grimdark. If this makes you run away like a puppy that just laid a brown egg on the new carpet, that's your prerogative entirely. Please don't tell me that I'm objectionable for having written it, though, because that's not very nice. Or accurate. At all.

The shiny new art is a commission by this lovely person, so do feel free to check her out for all your creepy-pony needs.

A diplomatic crisis arises between Equestria and the small, poor kingdom of Tarandroland, ancestral home of the reindeer. Celestia and Luna agree that it is time Luna takes a more active hand in foreign relations again, and Luna brings Twilight with her as someone she actually trusts and can talk to. But the mission turns out to be much more than political discussions - if scheming unicorn courtiers, unfriendly surly reindeer, bloodthirsty pirates, ancient sorcery and dangerous monsters weren't enough, our heroines must deal with something old - older than Luna. And is Luna really ready for diplomatic action, will Twilight learn to use a fan properly, and exactly how wrong are Spike's superhero comics about reindeer mythology?

Now has a TV tropes page

A simple crossover between FiM and Star Wars. Though the Rebel Alliance has successfully destroyed the Death Star, Twilight and her friends find themselves on the run from the looming Empire. As they desperately try to get to safety, Rarity and Rainbow's bond grows closer, and Twilight discovers a horrible truth.

The Elements of Harmony are defeated and Nightmare Moon stands on Equestria's throne as their new Queen. Is Equestria doomed to suffer through night time eternal or will they be... perfectly fine? Twilight finds her new job as slave or "personal assistant" to her new ruler to be a bit maddening. But is this evil sarcastic queen really as bad as she originally believed? And just how many others are diabolical enough to cash in on the change in staff? Can Nightmare truly run a peaceful Equestria? Let me just answer all these questions right here in the description...

Finding herself with wings and unusually powerful magic, Twilight Sparkle proceeds to have breakdown after breakdown, until with the help of her friends, she confronts Celestia and Luna about it... And learns that she's a far more important little pony than she ever imagined - for all the wrong reasons.

Awesome painting by Drezzer can be found here!

20 megapixel version is here (10MB JPEG, 210dpi strangely, 24"x20")!

Thanks, man!

The balance was lost eons ago when fear and anger drove two friends apart. Recent events have lead to Equestrian secrets coming to light, and Twilight Sparkle must recover what has been lost by rejoining two halves of an eternal whole, changing Equestria forever.

Posted on Equestria Daily

This is the story of the end. This is the story of the death of Equestria. It is the story of the reign of her royal majesty, Princess Twilight Sparkle of the Fading Sun.

The alicorn sisters are dead and Equestria has turned to Twilight Sparkle to guide it. However, just maintaining a dim sun a fraction as bright as her mentor's keeps the new princess near her limits.

Years have passed and Twilight Sparkle is sure of only one thing. Equestria is dying.

NOTE: Written before "It's about Time" in season 2. Everything after "Read it and Weep" was ignored throughout this story.

The Elements of Harmony are six of the closest friends in all of Equestria. But when a sudden tragedy strikes down one of the elements, how will the other five be able to handle their lives? Will they find the strength in themselves and each other, or will their inability to cope cause more tragedy for the group?

Featured on Equestria Daily December 30th, 2011

The Ponyville Six visit Canterlot to watch Rainbow Dash participate in a long-distance race. However, a visit to Twilight's favourite donut shop results in the bookish Unicorn finding herself in a pitched donut-eating battle with a certain pink Party Pony, with disastrous results.

This short story was created as part of a writing audition for the Equestria Online MMO.
I hope you enjoy it as much as the game's staff apparently did! :D