Adobe’s educational licensing allows teachers to download Classroom in a Book free and use it in classrooms. This is printed matter only, not the CD with the lesson materials. However, the educational license allows teachers to buy one copy of the Classroom in a Book with the CD and then distribute the lesson materials to classroom computers along with the downloaded book text. You must register as an educator with Adobe.
Adobe offers many other Instructional Resources including a free Adobe Web Project curriculum, free online training, and Quicktime tutorials.