Weighted Lists

Hi, I've been fascinated by Flickr's, del.icio.us and other sites' usage of these Weighted Lists. It's simple but effective and I really want to use it for a project I'm doing. So I had a look at Nick Olejniczak's plugin for Wordpress (available here: www.nicholasjon.com) but am struggling to understand the logic behind it. What I need is to dump all words (taken from the DB) from just one column into an array. Filter out common words (the,a,it,at,you,me,he,she etc), then calculate most frequent words to provide the weighted list. Has anyone attempted this? Thanks for any insights -- Will The Corridor of Uncertainty http://www.cricket.mailliw.com/ - Sanity is a madness put to good use -