Beyond The Code
An index of archives for adult het and slash stories featuring comic book characters.
Superstories
Interactive stories and archive, gen and adult, featuring Marvel and DC comic book characters.
The Lady Comic Slash Site
Stories based on female comic characters, including Batgirl, Catwoman, Wonder Woman, and Supergirl. Also offers a variety of shojoai stories in fandoms including Sailor Moon and Dragonball Z, and writers' resources.
The Legion of Superheros Fiction Page
Archive of Legion of Superheros fan fiction includes het and slash.
Tooshoes and Cat
Features erotic stories about Supergirl and comic book characters written by the pen-partners Cat and Tooshoes.
Yahoo! Groups: DC Comics Slash
Stories and discussion centered on fan fiction, including Batman and Superman. [Yahoo! registration required.]