When I read The Way of Kings by Brandon Sanderson last year (review), it was an ARC copy provided by Tor. While most of the illustrations in the book were not present, I thought that this visual support was a very good idea. Even though Einstein said that imagination is more important than knowledge (I may be stretching that idea too far in this case...), to have all these references about the wildlife and geography of Roshar only help build the world in my head. So, Brandon decided to post all the interior illustration on his blog.
Here are some samples, for all the rest, head on to his page.