Not sure how cool this really is but it was a result of me trying to get back to using *cough* windows command line after too much linux (is there such a thing??)

#! perl

system("cls");
print "perlshell ;)\n\n";

my ($dir, $line);
while(1) {
    $dir = `cd`;
    chomp $dir;
    print "$dir> ";
    $line = <STDIN>;
    chomp $line;
    $line =~ s/^\s+//g;
    $line =~ s/^ls( -\w+)?/dir/i;
    $line =~ s/^cp( -\w+)?/copy/i;
    $line =~ s:/:\\:g;

    unless( $line =~ /^cd/ ) {
        system("$line");
    } else {
        $line =~ s/^cd\s+//i;
        (chdir($line) or print "ERROR: Directory ($line) doesn't exist
+!\n") 
            if(length($line));
    }
}
[download]

Now all I have to do is replace the cheesy DOS imitation they call a command prompt with it ;)