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<div class="relatedposts">
<h3>Related posts</h3>
<?php
  $orig_post = $post;
  global $post;
  $tags = wp_get_post_tags($post->ID);
   
  if ($tags) {
  $tag_ids = array();
  foreach($tags as $individual_tag) $tag_ids[] = $individual_tag->term_id;
  $args=array(
  'tag__in' => $tag_ids,
  'post__not_in' => array($post->ID),
  'posts_per_page'=>4, // Number of related posts to display.
  'caller_get_posts'=>1
  );
   
  $my_query = new wp_query( $args );
 
  while( $my_query->have_posts() ) {
  $my_query->the_post();
  ?>
   
  <div class="relatedthumb">
    <a rel="external" href="<? the_permalink()?>"><?php the_post_thumbnail(array(150,100)); ?><br />
    <?php the_title(); ?>
    </a>
  </div>
   
  <? }
  }
  $post = $orig_post;
  wp_reset_query();
  ?>
</div>

.relatedposts {width: 640px; margin: 0 0 20px 0; float: left; font-size: 12px;}
.relatedposts h3 {font-size: 20px; margin: 0 0 5px 0; }
.relatedthumb {margin: 0 1px 0 1px; float: left; }
.relatedthumb img {margin: 0 0 3px 0; padding: 0;}
.relatedthumb a {color :#333; text-decoration: none; display:block; padding: 4px; width: 150px;}
.relatedthumb a:hover {background-color: #ddd; color: #000;}