[Mailman-Users] Making a Mailman legacy archive searchable?

Is there anything open-source to make a Mailman legacy archive searchable? What would be useful is a way for visitors to a website to be able to search the Mailman archives using a keyword and have it display those mail messages. I'm also thinking of having a tag cloud made up of the most commonly used words from the given Mailman archive. So when one of those tag cloud words is clicked on it lists as an index those messages. Any suggestions? Thanks!

David Roth