"We" by Zamyatin is one of the best books I read all of last year. It's out of copy right, so freely downloadable too. Found it much more compelling than either a brave new world or 1984, even though both those books are also great. "We" seemed much more coherent and thought through.

Reading his back story makes this even more interesting, given that he was living in a totalitarian state. I'd recommend reading his Wikipedia entry too.

In short: highly recommended reading.