Barely related, but I just thought I'd point out that the author writes, in my opinion, quite nice sci-fi too [1], ranging from short stories to a web serial.
I first ran into qntm.org when someone reposted the story "The artifact was completely impenetrable to all forms of matter except living human flesh"[1] from the Oul's Egg section of Fine Structure. I couldn't leave the computer until I'd read everything on the site.
Several web serials, as a matter of fact. Ed stories, Fine Structure, and Ra (his most recent). Sam's work is a bit unpolished and suffers heavily from a lack of planning (Ra's ending is a great demonstration of that as Sam himself said that it got away from him). But it's still some of the most amazing sci-fi I've read.
[1] http://qntm.org/impenetrable