WWW

Catalyst
"The elegant MVC framework". Designed with flexibility in mind, it lets the user choose among a variety of storage models, templating systems, web servers, and operating systems.
http://catalyst.perl.org/

Jifty
A way to build web applications based on the DRY ("don't repeat yourself") principle.
http://jifty.org/

Mason HQ
Mason is a Perl-based web programming language. Among other things, it allows Perl to be embedded in HTML.
http://www.masonhq.com/

Maypole
Perl framework for MVC-oriented web applications, designed to minimize coding requirements for creating simple web interfaces to databases, while remaining flexible enough to support enterprise web applications.
http://maypole.perl.org/

Perl for the Web
On-line (and print) book by Chris Radcliff about creating fast dynamic Web sites with Perl.
http://www.globalspin.com/thebook/

Web Client Programming with Perl
Full text of the out-of-print book by Clinton Wong.
http://www.oreilly.com/openbook/webclient/