I have a couple of columns I wrote on Moose:
part 1, and
part 2. They're a bit dated now, but a good gentle introduction.
And the funny thing is, I needed a quick reintroduction to Moose for a project recently, so I googled "moose perl". My columns came up pretty high on the list, so I read them to remind myself. {grin}
-- Randal L. Schwartz, Perl hacker
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.