1. All About Spike
Closed to new stories since 2006, but still contains over 1000 Spike-themed stories in the Buffy The Vampire Slayer universe.
Naughty "Spuffy" (Spike and Buffy) fan fiction stories, plus many more interesting things to look through here.
3. Charmed Fan Fiction Community
This LJ community is active, moderated and drama-free. Enjoy the stories of the Sisters Three.
4. Charmed: Role Reversal
A well-done multi-episode story set in the Charmed universe.
5. Edward Scissorhands Fanfiction
A large archive of Edward-themed stories. Fun to read through on a rainy evening.
6. Dark Shadows Fan Fiction
Sylvia Bond's excellent Dark Shadows fanfic stories.
7. Collinwood Fic
A Livejournal community for Dark Shadows fan fiction writers.
8. Lost Boys Fanfic
The Lost Cave's fanfic archive hasn't been added to since 2009, but I still really like this site.
9. Lost Boys: One Must Hide
A seventeen-chapter Lost Boys fan fiction story. This is a really impressive effort!
10. True Blood Fic
An active, well-moderated True Blood fan fiction community on LJ.
11. The Gossamer Project
A longstanding, excellent X-Files fan fiction resource. Tons to read here.
12. Being Human Fic
A strong, active Livejournal community for authors writing "Being Human" TV show fan fiction stories.
An excellent and up-to-date X-Files fan fiction archive.