Mainspring by Jay Lake - I'm a sucker for books with cover art by Stephan Martiniere, and I'd thought this was supposed to be a science fiction adventure novel, but it's not. It's much more of a rather archly conservative, creationist Christian fantasy tale of a clockwork world where intelligent design is made quite literal. While Lake has some truly inventive concepts here, I found the underlying message to more disturbing than thought provoking. I had to put this down about half way through. Rejected!
P.S. Please read the comments. I'm apparently off base on this one.