Finding installed Perl modules

I don't recall where I came across this little script, but it's quite handy for finding installed Perl modules along with their versions.

#!/usr/bin/perl
use strict;

use ExtUtils::Installed;
my $instmod = ExtUtils::Installed->new();
foreach my $module ($instmod->modules()) {
    my $version = $instmod->version($module) || "???";
    print "$module -- $version\n";
}