A list of frequently asked Perl questions with expert answers.

Book by Dave Rolsky and Ken Williams. Full text freely available.

Core documentation for the current version of Perl, in HTML and PDF formats. Features include highlighting and linking of code examples, labels, and a customisable display.

An "annotated CPAN": a site with all the documentation available on CPAN, along with user-supplied annotations on the margin.

An evolving book about Extreme Programming with Perl. Freely available in HTML and PDF.

by Rex Swain.

RSS feed with the latest notes posted to AnnoCPAN.

Book aimed at those who can already program in another language; emphasizes programming style. Distributed under the GNU FDL. [PDF/Postscript]

The Perl Crawler Search Engine is huge searchable index of all sites devoted to Perl and CGI programming, backed up with a state-of-the-art web indexing spider.

Book by Peter Scott about maintaining legacy code. Contents, excerpts, errata, and source code.