How can I implement "related articles"?

[eluser]Ghassem Tofighi[/eluser]
I want to show users related articles to any article in my cms. how can I implement such thing ? I want it will be available below each article.Do you suggest by tags or something else?

[eluser]Jamie Rumbelow[/eluser]
Tags sound cool. Every article you post, add a few tags. Then look for similar tags.