MY FANDOMS (THE ONES I'VE WRITTEN IN AND THE ONES I PLAN TO WRITE IN SOMEDAY):

[sunset_moth]

x - crossover
y1 - have written in (as oneshots)
y2 - have written in (multi-chaptered)
n - have not written in

Japanese Anime/Manga:

Aoi Hana (n)
Bamboo Blade (n)
Detective Conan (n)
El Cazador dela Bruja (n)
Kaleido Star (n)
Hayate x Blade (y1/y2)
Hunter x Hunter (y1)
Mai Hime/Mai Otome (x)
Madlax (n)
Magical Girl Lyrical Nanoha (y1)
Naruto (y2)
Noir (n)
R.O.D. the TV (n)
Saki (n)
Sasameki Koto (n)
Sora no Woto (n)
Strawberry Shake Sweet (n)
The Last Uniform (n)

Games:

Ace Attorney series + sequels/spinoffs (n)
Bioshock 1/2 (n)
Embric of Wulfhammer's Castle (n)
Final Fantasy series (x/y2)
Ghost Trick (n)
Heavy Rain (n)
Persona 3 (n)
Persona 4 (y2)
Resident Evil series (n)
Suikoden series (n)

Cartoons/Comics:

Avatar: the Last Airbender (y1/y2)
Kim Possible (n)
Runaways (n)

Books:

Harry Potter (y2)
Brandon Sanderson (n)
Codex Alera (n)
Tamora Pierce (n)
Young Wizard Series (n)

TV Series/Films:

Buffy the Vampire Slayer (n)
D.E.B.S. (n)
Inception (n)
Lost Girl (n)

Subject to revision at some point. >>