Sepia Tock was one I read, and it was pretty good (though I've yet to meet a Pony Fic I haven't liked... low standards, good luck, or a discerning eye?), and you've reminded me I need to read Sunset so I can get to Ciroton's newest story... if we're sharing lists, mine is:
Spoiler
Painless
Letters To and From a Princess (mostly finished...)
Out of The Blue
Fell Into The Right Hooves
One Day, They'll Throw Flowers
Within and Without
Slander
Legion of Gloom
The Romancing Quest (which I decided to check out because, despite its name, it is not tagged [shipping] )
The Combinatorics Project
The Secret Tub Fun series
Cloudsdale Chronicles
Sunset
Clash of The Heavenly Titans
For Want of A Dawn
And I'm also keeping watch on at least five fics. The fact that so many have caught my attention and made me want to continue watching for updates really says something about the quality of work in the fandom, I think.
I was hoping to get as much of the mane cast in the picture as possible, but those are all really good and I might use them, even if I can find one with more of the mane cast.