Very nice Abigail-II, but not slow enough! ;) If you will allow me to lift a few lines of your code, we can make it slower: 
use strict;
use warnings;
use POE;

my $in    = 0;
my $count = shift || 1000;

POE::Session->create(
   inline_states => {
      _start => sub {
         rand () ** 2 + rand () ** 2 < 1 && $in ++
      },
   },
) for 1 .. $count;

POE::Kernel->run();

printf "Pi equals %f\n", 4 * $in / $count;

[download]
UPDATE: yes, this is very much an attempt at humor. :O) No disrespect meant to you or my new favorite app framework, POE. ;)

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

In reply to (jeffa) Re: Monte Carlo approximation of PI by jeffa
in thread Monte Carlo approximation of PI by Abigail-II

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