catcloud Wordpress Plugin
Update: This plugin is no longer maintained. I'd recommend using Wordpress' built-in tag cloud functionality or the Simple Tags plugin instead.
catcloud is a plugin for Wordpress that generates a tag cloud from the categories used for a blog. Tags cloud are visual representations of how frequently a tag is used within a given set of tags. You can see an example of a tag cloud on the front page of http://zak.greant.com.
You can grab the most current copy of the plugin from http://zak.greant.com/catcloud-v0.5.zip.
The most recent version of the plugin (v0.5) fixes a CSRF security vulnerability (Thanks to Alex Concha for pointing this out), improves performance and improves some lazily written input validation code.
To install the plugin, unzip the zip archive into the wp-content/plugins directory of your Wordpress installation. Then open up the Plugins tab of the Wordpress administration interface and click on the Activate link for catcloud.
To generate the tag cloud, call the catcloud() function at the point in your template where you would like the tag cloud displayed.
To configure catcloud, visit the menu called catcloud Configuration in the Plugins tab of the administration interface. From this menu, you can control the various features of the plugin.
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