We’ve featured Susan Kare’s work before; she and her icons played a large role in Mac history. If you’re looking to dive in to a broader array of her images, check out her new book ICONS ($40); it features 80 of her favorite images.
Each icon is presented in a two-page spread. On the left is the size you’re used to seeing, along with occasional notes and inspiration. The right has a blown-up view that allows you to see each individual pixel. It’s a nice collection, and a fun way to learn a little more about the images that set the tone for popular graphical user interfaces.