lcfanfic.com - Lois and Clark Fan Fiction
Library of Moria - Lord of the Rings slash Fan Fiction
Mpreg Archive - Filled with Mpreg (male pregnacy) Fan Fiction from multiple fandoms
My Yahoo Groups
Smallville Mpreg
Jedi_Bant's Fan Fiction
Starwars Freeks
Superman_Batman-Clark_Bruce
Smallville Mpreg - yahoo group
Jedi_Bant's Fan Fiction - yahoo group
Fan Fiction.net
Also
Astrojen's Elves and Men - This is my favourite author, she has so many great fics, mostly slash.
The Slytherin Connection series - This was one of the first fics I ever read and i still love it. also found on ffn.