The book introduces the desiderata behind Erlang, all the basics of the language, and then more advanced techniques and how Erlang is designed to deal with them. We get a pretty good chapter on the generic moduels of OTP. After that, it's just case studies and more speculative parts.
The Erlang Bang Bang was kinda cool. Too bad it didn't make it :p
(I guess LYSE will be the better book, though this is good for getting an intuitive graps of Erlang ;-])
Very well written, not much fluff. The ending chapters are not much help but a great introduction to the fundamental design and architecture principles in Erlang based systems. Time to get back to a more textbook for Erlang.