The Comprehensive perl Arhive: http://cpan.org
You can get started using the search facility: http://search-beta.cpan.org

Once you find what you are looking for you can use the built-in CPAN module to load modules (on a unix-type box) or ppm (on windows using ActiveState Perl)

CPAN:

   perl -MCPAN -e shell
   help
[download]

ppm:

  ppm
  help
[download]

Hope this helps

-pete
"Worry is like a rocking chair. It gives you something to do, but it doesn't get you anywhere."