This plugin shows a list of 10 related post, called by rss from Google blogsearch.
Do you think that you're the only one who is writing about these things? Honestly, if my answer disappoints you, you should know that you're not the only one who is writing about these things. So, in this point comes this plugin to help you.
You could generate a link list of articles from other blogs, simply adding a custom field. The generated list it's based on Google BlogSearch, this means that in the created custom field, the value, will be a construction of keywords, which will be able to show other articles from other blogs, having the same subject.
Take a look at installation ...