WP Sortable Post Index

<table class="sortable">

<tr>
<th class="sorttable_nosort"></th>
<th>Post Title</th>
<th>Post Date</th>
<th>Categories</th>
<th>Tags</th>
</tr>

<?php
    query_posts( array(
        'posts_per_page' => -1,
        'orderby' => 'date',
        'order' => 'DESC'
        )
    );

    $count = 0; // Used to assign custom keys to cells in the date column

    if(have_posts()) : while(have_posts()) : the_post();

        $count++;
?>

    <tr>
    <td><a href="<?php the_permalink(); ?>"><?php the_post_thumbnail( array(50,50) ); ?></a></td>
    <td><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></td>
    <td sorttable_customkey="<?php echo $count; ?>"><?php the_date(); ?></td>
    <td><?php the_category(', '); ?></td>
    <td><?php the_tags('', ', '); ?></td>
    </tr>

<?php endwhile; endif; ?>

</table>