Children of Time - Adrian Tchaikovsky
Recent winner of Arthur C Clarke award this is a rather odd evolutionary tale involving fuckin big spiders. Basically, humans destroyed themselves, tried to take over a planet with evolutionary DNA, monkeys didn't survive, spiders took over. Pretty horrible read if you are not a big fan of the hairy buggers using their "palps" to communicate and eating each other.
Humans come along every so often after being in deep cryogenic sleep, try and fuck things up for the spiders.
Clever, but I guess you are supposed to root for the spiders eventually, and I never did.
Well written, massive imagination, well researched book but FUCKING SPIDERS.