I think you're looking for this node - it even has a reply that talks about a perlfaq ;-)

-- Tanktalus, too lazy to type in a full response, but thankfully this is PerlMonks, where Laziness is a virtue.. :-)

Is there a way to get a listing of installed modules on each box [...]?

just recollecting: On active perl with ppm installed type

ppm query *
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Try:

use strict;
use ExtUtils::Installed;
my $inst = ExtUtils::Installed->new();
print map "$_\n", @ARGV
       ? map $inst->files($_), @ARGV
       : $inst->modules();
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Update: This looks potentially very useful too: Search @INC And Display Modules.

use HTML::Perlinfo;

perlinfo(INFO_MODULES);
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If u want to find the installed modules of ur redhat linux machine, u can download this tool to find all Installed Modules

After downloading this tools extract to ur local apache cgi-bin directory and chmod 755 to the .pl file. Then request the file in the browser, which gives u a complete list of installed modules and other additional info about ur machine. This tool gives u exact answer what u want.

If my understanding is correct this tool will help u a lot.