According to its creator, WP-Cumulus allows users to display their website's tags, categories or both, using a Flash movie that rotates them with a 3D sphere effect. The plugin works the same as a standard tag cloud, but with a unique, visually appealing presentation. While clicking the tags may be somewhat difficult depending on the number of tags and speed setting, it will take a visitor to the designated page.
Setting up WP-Cumulus in WordPress is easy, although it requires that you run version 2.3 or better. After downloading the zip file and extracting the contents, you upload the 'wp-cumulus' folder to your plugins directory (wp-content/plugins/) and then activate the plugin through the 'plugins' page in WP. Selecting 'Options->WP Cumulus' allows you to adjust items like display size, etc.
Three display options are available for the tag cloud. You can either create a page or post and type [wp-cumulus] anywhere in the content, which is replaced by the flash movie when viewing the page. Users can place a snippet of code anywhere in their theme to display the cloud, such as in a sidebar, although many sidebars are not wide enough to keep the tags readable. A third option is to use the sidebar widget that comes with the plugin. This is accessed through 'Appearance'->'Widgets' to customize its own settings, such as background color, size, etc.
WP-Cumulus also outputs the tag cloud (and/or categories listing) for non-flash users, providing links for search engines as well. The links are hidden using CSS by default, but can be optionally made visible.
Finally, WP-Cumulus is not just for WordPress users, as a number of software ports are available, including versions for Blogger, Drupal, Joomla, Movable Type and other applications supporting tags.
If you want a way to jazz up your tag cloud, WP-Cumulus is it.