In the wake of my post on the tribulations of writing long stories, I found this description of writing a novel by YarnHarlot. Yup. It sounds so familiar!
Call for Submissions
I also found a call for submissions, aimed at slash writers who want to turn pro. You can find the details at Sybaritic Press. I haven't published anything with them, so I can't vouch for them personally, but I've heard on the grapevine that they are reputable (for what that's worth).
ETA: Re-posted to remove my previous ETA.