Perl 6
Perl 6 is a high-level, general-purpose, gradually typed language. Perl 6 is multi-paradigmatic. It supports Procedural, Object Oriented, and Functional programming.
Site: http://perl6.org
Books
Perl 6 Introduction
Perl 6 Introduction is intended to give you a quick overview of the Perl 6 programming language. For those who are new to Perl 6 it should get you up and running.