Here's an example:
http://www.technorati.com/tags/

Here's a tag cloud taken from Yahoo News:
http://yahoo.theherrens.com/index.php

Note: The larger the font, the more popular the phrase.

We will want to monitor tag clouds for "hot" phrases, as well as looking for ways to exploit tagclouds.

http://lorelle.wordpress.com/2005/10/14/a-tagging-bookmarklet-for-wordpress-and-wordpresscom-users/

btl