I like the TagCloud.
So what exactly makes some words bigger and smaller? Is it based on the entire PageDatabase, or just on the pages in RecentChanges in the last X days? Or just the pages in RecentChanges in the last X days, with some exponentially decaying weighting of more recent/more active pages?
Simple the number of times it has been used in the entire PageDatabase, without any activity or decay. If n is the number of times it has been used, and max the number of times the most popular tag has been used, and min the number of times the least popular tag has been used (usually min=1), the font size is (80 + 120*(n-min)/(max-min))% – so the most popular tag is at 200%, and the least popular tag is at 80%.
The number of times a tag has been used is in the title attribute of the link, so you should get a small popup in your browser, if your mouse pointer hovers over a tag.