microkid

This powerful plugin makes it super easy to manually select related posts for your content. You can search and select posts that fit your criteria, all from within the write/edit post screen.
Creating a system of related items on your website will result in more page views per unique visitor, and will improve Google’s understanding of your content.
As mentioned by <a href="http://yoast.com/articles/wordpress-seo/#relatedposts" title="WordPress SEO and Related Posts " rel="nofollow ugc">WordPress SEO</a> master Yoast:
<blockquote>
A very good alternative is Microkid’s related post plugin, which lets you manually pick related posts. This might cost a bit more time before you hit publish but might very well be worth your while.
</blockquote>
You can display related posts automatically underneath your content, use a shortcode or use the widget. Or, if you have some development skills, you can use one of the available API functions for full control of the way related posts are displayed on your website.
With its full support for Custom Post Types, this plugin will work perfectly for both basic and advanced WordPress installations.
See the official plugin homepage for <a href="http://www.microkid.net/wordpress/related-posts/" title="Wordpress Related Posts" rel="nofollow ugc">Related Posts for WordPress</a> for more info and discussion.
<h4>Features</h4>
<ul>
<li>Easily find posts or pages that might be related to the one you are writing with an integrated AJAX powered search utility</li>
<li>Easily add and remove relations with a single click</li>
<li>Extreme flexibility in the customization of the way the related posts are displayed on your website</li>
<li>The relationship created works reciprocal, which means that if post A is added as related to post B, post B is automatically added as related to post A as well (this option can be turned off easily through the settings panel)</li>
<li>Custom post types support</li>
<li>Multiple widget support with extended customization options</li>
<li>Shortcode support: add the [related-posts] shortcode to your post content to display related posts anywhere you want</li>
<li>Automatically display a list of related posts underneath your posts content. No need to add any PHP tags in your template files, but several <a href="http://www.microkid.net/wordpress/related-posts/#API" title="Related Posts for WordPress API functions" rel="nofollow ugc">functions</a> available for advanced users.</li>
<li>Available in a growing number of languages</li>
</ul>

So far good

Increase your pageviews and SEO by manually selecting related posts for your content. Easy reciprocal linking of related posts and pages.

Ash Durham

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<a href="http://kingpro.me/plugins/related-king-pro/" rel="nofollow ugc">Related King Pro</a> gives you an easy ability to display related posts on your site. The related posts are based on the tags on each post. 
When output, <a href="http://kingpro.me/plugins/related-king-pro/" rel="nofollow ugc">Related King Pro</a> will get posts in order of the amount of tags that match the post your calling the plugin on.
With <a href="http://kingpro.me/plugins/related-king-pro/" rel="nofollow ugc">Related King Pro</a> you have a few options including how many related posts will display at one time, whether not not to display images, 
the width and height of the image output and whether you require a placeholder (mainly for development using the placehold.it images).
<a href="http://kingpro.me/plugins/related-king-pro/" rel="nofollow ugc">Related King Pro</a> uses a smart imaging system where it will search for your images within the post in a couple of areas. 
It will first look for the feature image of the post. If this is not set, it will search the content for the first image inserted. If that then doesn’t exist, it will either, depending 
on the placeholder setting, it will display no image code or a placeholder image in its place.
<a href="http://kingpro.me/plugins/related-king-pro/" rel="nofollow ugc">Related King Pro</a> outputs an image (if one exists) and the title with links to the article on both surrounded by a number of containers with enough classes on them to 
enable you to style them to your requirements. 
There is bare CSS that comes with <a href="http://kingpro.me/plugins/related-king-pro/" rel="nofollow ugc">Related King Pro</a> which allows you to style the related articles any way you need to.
You can use <a href="http://kingpro.me/plugins/related-king-pro/" rel="nofollow ugc">Related King Pro</a> in two ways, either shortcode or widget. Both have the same settings available.
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If you have any suggestions or would like to see a feature in the plugin, please let me know in the support forum.
Any issues you are having, I’d also love to know, so again, please let me know using the support forum.
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<a href="http://kingpro.me/" rel="nofollow ugc">Check out the King Pro Plugins range</a>

Related King Pro

Drive your visitors to related posts via matching tags and keep them on site

Related Posts for WordPress vs Related King Pro