Anyone who is learning to program in Perl or who needs a refresher can find a number of valuable resources at this site. Possibly the most useful section is the Online Library, which has full text of four books on Perl as well as sample chapters of four additional books. The main page of the site has a link to an external introduction to the Perl language. Shorter technical articles that deal with specific applications of Perl are updated regularly, and users can sign up to be on a free mailing list for Perl tips.