Note: this was written for Joomla 1.x and is WAY stale; I use Joe's Word Cloud
A simple content plugin which generates a "keyword cloud" at the end of every article.
Keywords are selected from the article's metadata, comma-separated keywords. They are then sized 1-5 (definitions in css) based on the relative hit frequency in the keywords in all viewable articles.
Each keyword is linked out to a search page for that keyword.
This plugin has been validated against W3C XHTML/1.0 Transitional and CSS 2.1