D'Arcy Norman

The plugin gives users the oportunity to embed a tag cloud for a site within any page. 
When using the shortcode [tagcloud] when 
writing in the content of any page, the user includes in the page, a 
tag cloud for posts on that site.
I am working on adding the ability to set options, such as sizes, etc…

keith_wp

The normal WP Tag Cloud widget only uses one taxonomy at a time, and doesn’t handle the default post_tag or category taxonomies being assigned to custom post types.
With this plugin, you can now configure (on a per-widget basis):
<ul>
<li>which taxonomies and post types are to be included,</li>
<li>the size of the smallest and largest tags (in different font units),</li>
<li>which terms should always be excluded from the cloud,</li>
<li>the maximum number of tags to show in the cloud,</li>
<li>how to order the tags – alphabetically or by number of tagged posts (ascending or descending), or just randomly,</li>
<li>how to treat tags with just one entry – leave alone, remove them or link directly to that post,</li>
<li>whether to make links no-follow,</li>
<li>what case the tags should appear as,</li>
<li>the widget background and tag background/foreground colours,</li>
<li>and how long each widget’s output should be saved for, if at all.</li>
</ul>

Combined Taxonomies Tag Cloud

A widget to make tag clouds out of multiple taxonomies, across multiple post types and control their appearance.

Tag Cloud Shortcode vs Combined Taxonomies Tag Cloud