Map of CPAN
mapofcpan.org
mapofcpan.org
Here's the original post on PerlMonks: http://www.perlmonks.org/index.pl?node_id=943704
It lets you explore the CPAN ecosystem without installing the modules.
$ cpandoc XML::Twig
[ ... documentation for XML::Twig ...]
[1] Coincidentally, today's Perl Advent article covers cpandoc (http://perladvent.org/2011/2011-12-15.html).There are also Tasks::*, such as [1], at CPAN that can be a good start when you're looking for modules for a particular purpose.
edit: That map visualization seems to show CPAN package namespaces sized relative to the rest of CPAN. This does nothing to visualize the size of CPAN itself, therefore I don't see how "That's why we use Perl" is a valid comment in response to this visualization seeing as it seems to be implying that they use Perl because of the breadth/depth of CPAN.