Alberto-

Thanks for going to the trouble of writing this book! I think a lot of people in the Perl community, both newbies and veterans, will find it remarkably useful.

I've gone over what you have so far, and I have a list of suggestions. Some of them are based on my opinion, so feel free to use whichever ones you want, since it's your book!

Introduction

• You should mention beta.metacpan.org in the section with AnnoCPAN and such. It's a new way to search the CPAN.
• cpanm uses the CPAN MetaDB to discover module information, not the MetaCPAN. (The meta prefix gets thrown around too much!)

OO

• I feel like you should mention Moose first, as Moo and Mouse are modeled after it, and not the other way around.
• I think that instead of mentioning how Mouse and Moose include a meta model, Moo lacks one.
• You should probably mention the MooseX:: and MouseX:: namespaces that contain Moose and Mouse extensions, respectively. Maybe you should also cover some of the more popular extensions?

Web

• I think you should mention PSGI/Plack. All of the frameworks you currently mention support it, and it's the direction in which Perl web development is moving.
• You might want to mention the CGI module, just for historical purposes.

Markup

• JSON and YAML aren't markup; they're more like data formats. They definitely deserve a mention in this book, though.

Testing

• You should mention Test::Exception; it makes testing code that leverages exceptions very easy.
• You should also mention Test::Class; it's a Perl-style way of writing xUnit tests.

More Modules/Chapters

I know you're probably just getting started, but I wanted to mention some other useful modules sooner rather than later:

Event Loops

• AnyEvent
• POE

Command Line Tools

• App::Ack
• App::pmuninstall
• App::cpanoutdated
• pmtools

Module Authoring Tools

• Dist::Zilla
• shipit
• ExtUtils::MakeMaker
• Module::Build
• Module::Install

Deployment Tools

• App::FatPacker
• carton
• Shipwright

OS Specific Modules

• Win32::*
• Mac::*

Miscellaneous

• Try::Tiny
• Data::Dumper
• Devel::REPL

Thanks again!
-Rob