CPAN

It's a vast repository of modules that people have contributed.

It stands for Comprehensive Perl Archive Network.

Use the alternate search at metacpan.org

There's a different interface to CPAN at .metacpan.org has more features and links for exploring the CPAN and distributions.

http://cpanratings.perl.org lets you rate and comment on modules and see what others thought of them,before you try.

Report bugs at rt.cpan.org

lets you annotate the documentation for a module,with the hope that the author will incorporate the changes in the future.

Find old versions of modules on the BackPAN

http://backpan.perl.org/ has every module ever on CPAN,even if it's old and out of date.