Fanfiction:

Fanfiction.net
A resource for writing, reviewing and reading fanfiction stories.

Star Trek Fanfiction
Stories and parodies listed by author and series. Includes stories from all the series through Voyager.

ForceNet Fanfiction
Star Wars fanfiction.

RPG Classics
A growing helping of RPG Fanfiction from many popular RPGs.

Dark Side of the Net
Dark, Gothic, and Vampire Fan Fiction.