Adds parameters to WordPress' tagcloud for filtering out insignificant tags.
It is a measure for a set of numbers telling you how far numbers are on average away from the average. For details, look the term up on Wikipedia.
You can use it for setting up tag clouds that scale with your blog, in a sense. Other than dropping a fixed number or percentage of tags, it will truly remove exactly those tags with significantly less posts than your average tag has.
You can