Download the muiltitouch texbook "the decibel (4MB, opens new window)" directly from an iPad. Or download it to a computer and sync to an iPad via iTunes. (note: this is currently version beta4).
Viewing this multitouch textbook requires an Apple iPad and the free iBooks app (version 2.0 or later). If you do not have access to an iPad, you can download a PDF (1.4MB, opens new window) version here.
This multitouch textbook was created with iBooks Author, a free development tool from Apple, Inc.