Boy In the Striped Pjamas - Louise Bolton (Central E)

Wow!  What a powerful book.  I was blown away by the emotions and images created such a simple story created.  It really is a great example of how a plot is more important than using 'flowery' language to engage your reader.  I would love to read it again just to see what would happen.  It really makes you think about life on several levels.
As mentioned by a few other posts, I would be cautious when sharing this with a class but as long as you are sensitive to the issues raised I think it's a great book choice.