# myscript.pl

use SuperModuleLoader; # or whatever

my $c1 = SomeClass->new;
my $c2 = SomeOtherClass->new;
my $mech = WWW::Mechanize->new;

##</code><code>##

package SuperModuleLoader;

sub import {
  my $classes = [qw/SomeClass SomeOtherClass WWW::Mechanize YourMom/];
  for my $c (@$classes) {
    require $c;
  }
}

1;