<?php $args = array(
'showposts' => 4,
'tag' => 'top'
);
$topstories = new WP_Query($args);
if ($topstories->have_posts() ) : while ($topstories->have_posts() ) : $topstories->the_post(); $storycount++;
if ($storycount == 1 ) { /* Post 1 only*/ ?>
<div>
<h2><?php the_title(); ?></h2>
<?php the_excerpt(); ?>
</div>
<?php } else { /* Posts 2-4 */?>
<div>
<h4><?php the_title(); ?></h4>
</div>
</div>
<?php } ?>
<?php endwhile; endif; ?>
<?php wp_reset_query(); ?>