I’ve just installed a plug-in called Related Posts (well actually it’s REALLY called Yet Another Related Posts Plugin or YARPP).
This is another tool that is designed to help the search engines with deep searches and indexing of your site.
I briefly talked about this plug in here http://www.oibo.org/8-wordpress-plugins-you-must-have-for-your-wordpress-blog.html.
The related posts plugin works on individual posts – so if you were to click on the link above you would see a section at the end called Internet Business Related Posts along with 5 related posts.
I will be testing this out for the next few weeks to see how well it works, and will let you know!