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By cross-linking to related content on your site it will help with internal linking. In addition to helping visitors navigate around your site it also creates more keyword rich anchor text. A plug-in like Contextual Related Posts is a good one to use. After you download it follow the instructions below.

1) Copy both related_upgrade.php into the root of your WordPress blog and related.php
to wp-content/plugins
2) Run related_upgrade.php from a browser. It should say it was successful
3) Enable the related plugin from wp-admin/plugins
4) Open up your index.php and add this line within the loop where you want the related items to show:
<?php if (preg_match(”/related/i”,get_settings(’active_plugins’)) && $single) echo related($post->post_title); ?>