If you use Wordpress as your blogging platform you might want to read this ten point tutorial on how to optimize your Wordpress blog. Here is tip number five:

5. Related Posts
When a person visits your blog you want then to stay for as long as you can. One of the best ways to keep visitors interested is to show them other content on your blog that may be related to the post they are currently reading. The easiest way to do this is with the ‘Related Posts‘ plugin. Upload using your FTP client into the wp-content > plugins folder, then login to your Wordpress admin panel and activate the plugin from the ‘Plugins’ page.

To read all the other nine ways you can optimize Wordpress just go to boydcreative.net.