Yet Another Related Posts Plugin (YARPP)

This plugin helps guiding readers to other relevant and related content.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

Features:

• An advanced and versatile algorithm
• Templating
• Caching
• Related posts in RSS feeds
• Disallowing certain tags or categories
• Related posts and pages

What is new in this release:

• Added experimental graph data method to the YARPP table cache class.

What is new in version 4.0.4:

• Bugfix: widget control JS was not working right when first adding a widget
• Added ability to set widget-specific heading for the thumbnails view, by request
• Added the filter yarpp_results

What is new in version 4.0.3:

• YARPP template files no longer recognize Template Name fields in their headers, instead using YARPP Template. This is to avoid confusion with regular page templates.
• Added "Related Posts" meta box to other "auto display" post types.
• Updated Polish localization.

What is new in version 4.0.2:

• Localization updates.

What is new in version 4.0:

• New thumbnail template option.

What is new in version 3.5.6:

• Typo fix for postmeta cache.

What is new in version 3.5:

• Bugfix: "related posts" preview metabox was not always working properly
• Changes to the related_*() and yarpp_related() function signatures.
• Added "consider with extra weight" to taxonomy criteria as well
• Code cleanup

What is new in version 3.4.3:

• Postmeta cache: make sure to clear keyword cache on flush too
• Make welcome pointer more robust
• More custom post type support infrastructure
• Updated Turkish localization

What is new in version 3.4.2:

• Fixed typo in yarpp-template-random.php example template file
• Improved compatibility with DB Cache Reloaded plugin which doesn't properly implement set_charset method.

Requirements:

• WordPress 3.1 ori higher