This plugin is no longer in active development, use at own risk , Source/Fork: Github
The Related Posts plugin puts you in control on what really is related content and comes with many features integrated!
With the plugin installed you will find a Related Posts box underneath the Post Editor. On the frontend the Related Posts are shown in their own class with an unordered list, right after
the_content(). The class will use the styling of your theme and you can style it further to your own liking.
On the Settings Page you can change the title that shows on the front end above the list of Related Posts. By default the title is "Related Posts". You can also choose whether or not to include a small thumb of the Featured Image. This thumb is dynamically resized using the Aqua Resizer-script. Last but not least you can style the output of the Related Posts right from the settings page and we have included some samples to get you started!
The meta box is only visible in the Edit Post screen. Needless to say is that it requires the Meta Box plugin to be installed too.
The idea for this plugin came to us as we were thinking about an alternative method to make a Related Posts plugin that doesn't query the database n times looking for related posts by tags, categories or what not. Most of the existing Related Posts plugin have an incredible (negative) impact on your site speed, so the benefits don't outweigh the costs.
We thought that it would be much more flexible if the user can choose his/her own Related Posts from a simple Posts drop down menu.
Among heaps of other very useful fields, the Meta Box plugin comes with both a Post field and a Repeater field. We have combined these two and made it so that you can now show as many Related Posts as you want underneath the current Post.
We have pulled this plugin from the WordPress Plugin Directory, thus it is now only available via our Github Repo.