The new eBook contains 370 pages. With 15 chapters is one the most complete books about Asterisk. Writen by a dCAP, Flavio E. Goncalves, the book can be used by begginers with basic installation and configuration and advanced users with chapters including AGI-AMI and Asterisk Real-Time. It is available in English, Spanish and Portuguese. It is organized as a self-study book and is ready for the 1.4 version.
You can download the first three chapters free at asteriskguide.com