Call me crazy, but I have suddenly decided that I need Arthurian slash. I read one once in a book of short stories, Arthur and Dinidan. It was shocking to me. I was like 15, so that mighta been part of it. Slash was not the phenomenon it is today 7 years ago. Anyhow, this is what I've found (adult content in these links, so don't be a loser and complain to me hehehe)
http://strangeplaces.net/torch/swee
That one is Gawain and the Green Knight derived. It's not bad, I like it!
and...
http://www.duskdarkling.org/master/omos
Which is really very good. Excellent grip of the Arthurian mythos, it's obviously someone who knows her sh*t, and with the added bonus of a crazy classics background (Which I don't have, so for all I know she's making it up... but I doubt it.) It's really very good.
Anyone know of anything else? This whole talk of Lance/Arthur lately has me thinkin...