Tough crowd here! :-)
This book is a good overview of Digital Performer, and will get you past newby into intermediate level quite well. If you haven't used DP, it's a very deep program that has a high learning curve (as do all heavy sequencer progs). This book will help get you going and getting the basics under control. If you've bought the program, then you're no doubt finding yourself scratching your head at times with the reference manual. This book fits perfectly between the MOTU Getting Started Guide and the Reference Manual.
Nicely done graphics, good if you're a visual learner.