Gromet's!  If you like mummification, self-bondage and latex stories, you simply must go here.  Also has picture galleries.

Thundrshark  -  Great stories involving latex, body mods, SM, and sensory deprivation.  Also has some drawings and photos.

FictionMania  -  TG transformation stories (forced and otherwise).  Huge archive.  (possibly currently down)

Mcstories  -  Mind control stories, lots of various topics.

Thrall  -  My favorite author in the previously mentioned Mcstories.  Exquisite.

Madam Kistulot  -  Stories of sapphic mind slavery and superheroism!

Haircutting Stories Archive  -  Name says it all.

BDSM Library  -  A big ole archive or BDSM type stories.