The instructors at American Graphics Institute have written about Apple's Mac OS and how to easily work with and use the the Mac OS. They also teach other Apple apps, delivering Keynote courses and Final Cut classes as well.
Mac OS X Snow Leopard Digital Classroom Book with DVD
Mac OS X Snow Leopard Digital Classroom is like having a personal instructor guiding you through each lesson, while you work at your own pace. This Snow Leopard book and DVD is a full-color, all-inclusive training package that serves as an invaluable learning tool for Mac users of all levels of experience.