So here's some stuff I'd favorite if it was on FF.net.
The Very Secret Diary
The exchanges between Tom Riddle's diary and Ginny Weasley.
Yet Another KotOR Parody by Helena L
What it says on the tin. But it's perhaps the best one.
Faces Through the Veil of Smoke
HIMYM AU. It’s a ghost story. Except for all the ways it’s not. [Mostly gen with hints of Barney/Robin, Marshall/Lily, Ted/Victoria, Ted/Robin, Robin/Marshall]
Sailor Moon Dungeon Keeper x-over, totally awesome.
The One With Sasuke/Sakura Smut