ThugLit.com is open to submissions.
I quote from their website:
"This is a genre-specific mystery and noir website. If you don't know what that means, then don't send me your damned story. No Sci-Fi, Horror or Romance. Erotica (by way of sex) is okay, but PLEASE have violence, crime, murder, mayhem and chaos. Or a monkey. We like monkeys. They throw poop."
For details, see their submissions information.