[Asterisk-Users] Asterisk book feedback

[Ross C]

Just curious what everyone (as in, the people that have read it or use it)
thinks about the O'Reilly Asterisk book.  I'd really like to delve into the
nitty gritty of Asterisk, but I'm getting kinda tired of swimming through
forums and Google results.  I've been reading the wiki off and on for about
a week now, but I'm wondering if a book would be the way to go to get a
solid foundation.  My IT career for the past 10 years has been based off of
learn-as-I-go methods, but I'd really like to learn asterisk the right way.
I have a couple Asterisk servers up and running and in use, but they're very
small systems (~10 extensions, connected to 3 or 4 pots lines).  I have some
clients that want to use VOIP, but they're bigger businesses, and I'm not
yet comfortable enough to roll out a bigger system.
So if there are any other methods for learning Asterisk that I should
consider, please do tell! 

Any opinions (on the book or otherwise) appreciated.  Thanks!


-ross