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The Category Cloud Widget is a widget that displays your categories as a tag cloud in your sidebar.
<h3>Examples</h3>
You can see this in action on my site: <a href="http://leekelleher.com/linklog/" rel="nofollow ugc">http://leekelleher.com/linklog/</a>
<h3>Special Thanks</h3>
Thank you to Matt Kingston, as this widget was based on his <a href="http://www.hitormiss.org/projects/weighted-categories/" rel="nofollow ugc">Weighted Categories</a> plugin. 
Thanks to <a href="http://www.minmen.nl/" rel="nofollow ugc">Peter Hasperhoven</a> for introducing the ‘minimum number of posts’ option.

Category Cloud Widget

The Category Cloud Widget is a widget that displays your categories as a tag cloud in your sidebar.

daill

WP-Cirrus is a plugin that displays a 3D tag cloud in your WordPress. It can be 
used as a widget or anywhere on your blog using the [wp-cirrus] code.
WP-Cirrus was inspired by the famous WP-Cumulus plugin. WP-Cirrus uses no Flash, 
but only JavaScript and CSS to display the cloud. It gets all meta tags directly 
from WordPress.
Our plugin makes no use of external libraries that have to be loaded with it at runtime 
(e.g. jQuery or even Flash). This makes it very small and fast to load.
As it’s still under development more releases will be seen in near future.
Have fun and tell us what you think about it.

WP-Cirrus

A 3D JavaScript tagcloud inspired by WP-Cumulus.

Category Cloud Widget vs WP-Cirrus