First off, let me define Speculative fiction for any who might not be too sure about the genre.
Actually, let me let Wikipedia do it for you.
Speculative fiction is an umbrella term encompassing the more highly imaginative fiction genres, specifically science fiction, fantasy, horror, supernatural fiction, superhero fiction, Utopian and dystopian fiction, apocalyptic and post-apocalyptic fiction, and alternate history in literature as well as related static, motion, and virtual arts.
So that pretty much covers it. This challenge is being hosted by Floor to Ceiling Books
and if you want to join in on the challenge, that's where you sign up :) You have to read and review a minimum of 12 books during 2011 and there is the chance to win prizes as you go along. So what are you waiting for?