Elcenia is not really rationalist fiction, but I use some rationalist-y tropes (like big results not always having big causes). I'm not out of Greek letters to assign to betas yet. If you're caught up on the series, let me know if you want to read in-progress chapters via IRC and comment on them.
I should also clarify that mine isn't really intended to be "rationalist fiction" either, but I would like it to be something that rationalists can enjoy.
This community has a recurring interest in "rationalist fiction," and several members who are writers. I wonder if it would be useful to create a space where Less Wrong members could provide each other constructive criticism and encouragement on in-progress original writing projects?
Disclosure: I'm working on a sci-fi novel right now, and my regular circle of "beta readers" are fantasy fans and aren't providing much feedback on the new project. I am much, much more productive as a writer when I get steady feedback, so I have a personal interest in looking for something like this. Less Wrong came to mind as a community of intelligent, creative, forward-looking types who are likely to enjoy sci-fi.