This is one of my all-time favorite non-fiction books, written by a cognitive science professor at my alma mater. Some of the ideas he's come up with seem so obvious and helpful that you wonder why, in the years since he's written the book, the poor designs he specifically pointed out still exist in our society. For example, doors should not have to be labeled "push" or "pull". The kind of handle on the door should look like something you would either only push or only pull. Read the book and you will see what he's talking about.
