I should clarify that, sorry if that was confusing. If I change the code slightly, so it is thus:

#!/usr/local/bin/perl -w

use strict;

use LWP::UserAgent;
use HTTP::Cookies;
use HTTP::Request::Common qw(POST GET);;
use HTTP::Headers;
use HTML::Parser;
use URI;

my $cururi;
my $url;
my @urls;

my $sessionid;
my $browser = LWP::UserAgent->new;
my $email = 'xxxxxxxx';
my $password = 'xxxxxx';
my $req;
my $res;

#$browser->cookie_jar(HTTP::Cookies->new(file => 'cookie_jar', autosav
+e => 1));
my $cookie_jar = HTTP::Cookies->new(file => 'cookie_jar', autosave => 
+1);
$browser->cookie_jar($cookie_jar);
my $initurl = "http://www.amazon.com/exec/obidos/flex-sign-in/ref=pd_n
+fy_gw_si/";
&browserEmulation($initurl);

open(CJ,"cookie_jar");
while (<CJ>)
  {
    chomp;
    if ($_ =~ /session-id\=\"(\d*-\d*-\d*)\"/)
      {
    $sessionid = $1;
      }
  }
close(CJ);

$url = "http://www.amazon.com/exec/obidos/flex-sign-in-done/$sessionid
+";
#$res = $browser->simple_request(POST "$url",
#               {
#                'email'     => $email,
#                'action'    => 'sign-in checked',
#                'next-page' => 'recs/instant-recs-sign-in-standard.ht
+ml',
#                'password'  => $password,
#                'method'    => 'get',
#                'opt'       => 'oa',
#                'page'      => 'recs/instant-recs-register-standard.h
+tml',
#                'response'  => 'tg/stores/static/-/goldbox/index/',
#               });

$req = POST $url,
  [
   'email'     => $email,
   'action'    => 'sign-in checked',
   'next-page' => 'recs/instant-recs-sign-in-standard.html',
   'password'  => $password,
   'method'    => 'get',
   'opt'       => 'oa',
   'page'      => 'recs/instant-recs-register-standard.html',
   'response'  => 'tg/stores/static/-/goldbox/index/',
  ];

$cookie_jar->add_cookie_header($req);
$res = $browser->request($req);
print $req->as_string();
print "\n\n===========================================================
+========\n\n";
print $res->as_string();
[download]

When I print out the request and response objects I see the cookie in the request, yet no cookie is sent back in the response or appears to get through. Perhaps the server is doing something there, if so it is strange.