"Earth Abides" by George R. Stewart (Library. Nicely unsettling bit of post-apocalypse, tracing the setting up of a new community after the majority of the world population has died in a possibly man-made epidemic. It was written in the late 40s and sometimes that shows - the way the few black people the hero meets are described for instance, and the obsession of the protagonist with his intellectual superiority. Overall though I enjoyed it, but I'm unlikely to ever want to read it again.)
"Emprise" by Michael P. Kube-McDowell (Library, not yet finished).