Some of my favourites

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  Your Fangs Are Showing An unexpected encounter with a stallion helps Fluttershy feel better about a personal problem... and leads to something more. by Bucking Nonsense 6,603 words · 1,787 · 37
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  No, I Am Not A Brony, Get Me Outta Equestria! A non-brony is transported to Equestria by BronyWriter 110,814 words · 4,713 · 228
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  Ten Years Gone A human-turned-dragon finds herself in Ponyville... After spending a decade as a globetrotting adventurer. The only problem is that Ponyville is the very last place she wants to be, for a fact as plain as her appearance. by Some Other Guy 13,682 words · 2,173 · 54
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  Arrow 18 Mission Logs: Lone Ranger A mission to investigate a far off world takes an interesting twist. by AdmiralTigerclaw 66,018 words · 6,217 · 88
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  A Dark Knight for Equestria The Dark Knight descends upon Equestria by Onomonopia 106,230 words · 1,644 · 50