I'm reading "The Last Man" by Mary Shelley - I wanted to read it before the film comes out.
Before that, I read her more famous book "Frankenstein: The Modern Prometheus". Both were written more than 170 years ago, so some of the language is a bit hard-going, but its well worth persevering.
Oh, and both are available as free downloads from Project Gutenberg (
http://www.gutenberg.org/wiki/Main_Page).