This isn't much of a review but serves as a replacement to google's desc of the movie as it is horribly wrong, so here is mine:
Todd Hewitt lives in Prentisstown, a settlement on the New World. All the men on the New World are affected by a substance, which makes all their thoughts be visible outside their heads in a gas like appearance. He hasn't ever seen a girl or woman as the native species killed all of them, that is until he meets Viola, a girl from outer space. What happens next is something you won't expect...