In the movie The Lord of the Rings, Peter Jackson did a great job making the One Ring, an inanimate object, a character. It has a cameo in The Hobbit trailer.
Should be fun to see what Jackson does with the Arkenstone, a huge diamond over which a war is almost fought. It is a red herring- the real plot device is the plain gold ring ignored in the hobbit Bilbo's pocket.
Due out in December 2012!