For speculative fiction? Weird fiction. I've lately been introduced to China Miéville via Embassytown, and now I'm halfway through his Perdido Street Station and loving it. Equally, the first couple of chapters from The Vorrh (B. Catling) captured me instantly. Looking forward to reading the others in the trilogy.
For sci-fi? I'd like to see more of the biopunk side: bioengineering exploration in difficult conditions. None of this perfectly-functioning hydroponic lifeship stuff. I want things to leak, to rattle, to break. I want this to include the subset of things that is people. I want the setting to be dark and cramped and claustrophobic. I want an entire genre of Starfish.