I agree that Coraline is wonderful but I hasten to point out it really might be too spooky for some kids so make sure to read it to yourself before you read it outloud to your kids. That way you can better judge if they are ready for it. I found it wonderful but definitely a bit creepy at times and think it is too scary for Rowan still (he's 4).

I loved Newton's Cannon. By the third book I didn't like it as well but overall I liked the trilogy and am glad I read them. Very interesting.