It’s also possible to display similar posts in your blog so as to draw the attention of visitors and engage them. I know you will be tempted to use a plugin to display similar posts, but there is no need to overload your WordPress blog with plug ins when you can use tags and custom codes. Here is a powerful code to do display related posts quick…

wp_similar_posts.php

<?php
//for use in the loop, list 5 post titles related to first tag on
//current post
$tags = wp_get_post_tags($post->ID);
if ($tags) {
  echo 'Related Posts';
  $first_tag = $tags[0]->term_id;
  $args=array(
    'tag__in' => array($first_tag),
    'post__not_in' => array($post->ID),
    'showposts'=>5,
    'caller_get_posts'=>1
  );
  $my_query = new WP_Query($args);
  if( $my_query->have_posts()){
    while ($my_query->have_posts()) : $my_query->the_post(); ?>
    <p><a href="<?php the_permalink() ?>" rel="bookmark" title="
    Permanent Link to <?php the_title_attribute(); ?>">
    <?php the_title(); ?></a></p>
    <?php
    endwhile;
  }
}
?>