In reply to Wonko The Sane: Ok, I've just seen it.
It's difficult to just say 'go see it' because people will come away from the book with different ideas of what any film should be, so it's going to be personal as to whether you like it or not.
But it is pretty faithful to the book.
Cinematography is VERY good with a few very minor exceptions in a few of the life boat scenes. But the CGI is seamless.... possibly because you're abosrbed in the story. Possibly because it's the emaciated tiger that gets the most CGI shots. The 3D is about the best I've seen of any film.
I won't comment on the storyline, which you'll know already except to say I'm an atheist and still enjoyed the story. Some people say it's too overtly religious. I see it more as a window into the mind of someone who looks at the world differently, partly through character and partly because he went through something which made him act against his principles and he finds it easier to accept the story himself in his own way and by externalising his 'badness' feels more able to continue being 'himself' after.
Anyhoo. I say 'Go see it' if you're a fan of the book.