WP-Cumulus allows you to display your site's tags, categories or both using a Flash movie that rotates them in 3D. It works just like a regular tags cloud, but is more visually exciting.

More Informations on how to configure BMS TagCloud can be found here:
Configuration Options BMS TagCloud

More Informations about WP Cumulus you can find here:

BMS TagCloud outputs (as WP Cumulus dows) the regular tag cloud for non-flash users. This means that search engines will see the same links. They're hidden through CSS by default, you can see them if you change display mode to “Classic TagCloud” in the module settings.