Original Homoerotic Fiction by Ann Somerville - All of the stories are great. So read everything!
Common As The Rain.com - Also read all of the stories here.
Kathara's original slash / yaoi recommendations - Click Online Fiction, then fantasy. Check out Immortal Nights. There are some other good ones there, but most of them are either not being updated or the links don't work anymore.
bishiejoy.com - Check out Swan Prince and The Phoenix Key.
Misc. Slash - Look for The Further Adventures of Clive, the Leather Hairdresser, and Dreams of a Dom.
Midnight's Place - Wizards and Warriors
Maureen Lycaon's Velan Archive of Erotica - Check them all out, but be prepared for some werewolf/bestiality.
Lemons and Cream - Touched, but also the other stories.
Empty Mirrors - Go to Josey's Fiction and look for Whisper After Dark.
Bishounen Works - Go buy Bloodraven! I'm so sad it's not free anymore. /cry
I shall post more when I find them. Sorry that there are no summaries, I just suck like that. But please do check them out. There are some really good writers (and some not so good, but still enjoy the stories).