The author starts off with a quick overview of the CPAN, describing its purpose, design, and history. He also describes how to browse, search, and install modules from the CPAN, using the CPAN module from the Perl distribution. He also makes note of the Perl Package Manager (PPM) from ActiveState, and gives short examples on how to use it.
A superb book written by two hard-core Perl advocates, succeeds in its stated mission to offer a complete demonstration of the use of Perl for CGI applications. Rather than simply describing how Perl excels at CGI apps, they show you -- with elegantly written examples for a wide variety of CGI applications.