I really like these, they would be really nice in a small room where there may not be room for a book case. You could make them with only 2 or 3 shelves and then a dresser or other piece of furniture could still go against the wall below.
I think they would be nice if you had toddlers as well. You could still display your treasures without worrying about them breaking them. Timpaslay has the instructions over on Instructables.