The tags will be for showing "related pages," more specifically for determining whether or not the pages are actually related. At the bottom of each article displayed on my site, I would like to display a "related articles" section that shows links to 5 related articles determined by tags.

The article author will add tags to the article when it is created. on the .PHP page for an article, I would place code at the bottom that generates the list of links based on the tag algorithm that determines the 5 most relevant articles. I can think of a few different ways to do it, but I know there must be a lot of scripts out there that do already do this... so rather than trying to reinvent the wheel from scratch I thought I'd ask you guys for some suggestions. Thanks a lot for your reply!