Very nice. A couple of notes:

• unshift into your past days so you don't have to reverse printing them
• Lingua::EN::Number::Ordinate takes care of that yucky hardcoded list of day names

Here's my shortened version

#!/usr/bin/perl
use warnings;
use strict;
use Lingua::EN::Numbers::Ordinate;

my @past_gifts;
my $day = 0;

for my $todays_gift ( <DATA> ) {
    chomp $todays_gift;
    my $dayword = ordinate(++$day);
    print join( "\n",
        "On the $dayword of Christmas",
        "My true Perl gave to me",
        $todays_gift,
        @past_gifts,
        ("") x 2,
    );
    unshift( @past_gifts, @past_gifts ? $todays_gift : "And $todays_gi
+ft" );
}

__DATA__
a commandline in an @ARGV
2 sca-lars
3 ar-rays
4 nested hash
5 ENCODED STRINGS
6 threads-a-spawning
7 procs-a-forking
8 tests succeeding
9 modules loading
10 objects blessing
11 signals catching
12 saints-a-drinking
[download]

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