LinkWithin is the newest contender in this market. The plugin looks at tags, but it also analyzes other factors like relevancy, popularity, and recency. Unlike similar plugins, however, LinkWithin doesn't just display a list of headlines underneath each post, but also a thumbnail with a picture from each post, which makes it far more attractive than most of its competitors.
The plugin is available for Wordpress, Typepad, and Blogger, though LinkWithin will also provide you with a code snippet that you can use on other blogging platforms. We assume that LinkWithin does some semantic analysis in the background in order to arrive at its list of related stories, though we weren't able to track down any details.
In testing LinkWithin on our own WordPress blog, the suggested posts were always spot-on, but obviously, your mileage may vary.
A Few Caveats
Because LinkWithin does most of the computing on its own servers, it can take a little while before its results appear on your blog (usually around one hour). The plugin also doesn't play nice with every theme, though the team promises to fix any problem you might encounter within a few hours after you contact them.Verdict
LinkWithin is still a bit rough around the edges. It would be great, for example, if you could actually customize how the related items are displayed on your blog. For now, you are restricted to showing three related stories, for example, and the related stories will appear on both your homepage and on individual posts.If you are looking for a different way to showcase more of your blogposts on your blog, however, LinkWithin is definitely worth a try.