Why CGI::Application?

Perl
Mapping form parameters to actions: easy, consistent
Easy to separate HTML view from data and action
i.e., following the Model-View-Controller design pattern
Or not, if you'd prefer: fully TMTOWTDI-compliant
("There's more than one way to do it")
Very configurable:
Not wedded to any particular pre-existing Perl modules;
not even CGI.pm
Quick to set up & use:
Doesn't require Apache, mod_perl or any particular HTML templating language
Easy to maintain & expand