Dead Sunflowers by nasty_shrew (S/X crazy!Xander It's soooooooooooooooo good.)
Red Right Hand series by Witling (S/X Vamp!Xander. It's really good and I wish it was being continued)
Boglescat!verse by Witling (S/X with sick Spike, and its really addicting, this story also turned me onto LJ))
The Magic Number by Witling (S/X h/c ish good, keeps me on edge waiting for chapters.)
Letters by Rubywisp (S & X friendship. Lettters)
Damaged Whore!Xander by Rubywisp (S/X just plain fun)
Also, if you don't go and read:
I will never talk to you again. Or at least for a couple days. It's a Prison!verse S/A it is soooooooooooooooo good! I want more now! Lol, she's also really good at updating every couple of days, so enjoy.