Cumulus categories cloud is the ported version of WP-Cumulus of Wordpress which allows you to display your site's tags or categories using a Flash movie that rotates them in 3D. It works just like a regular tags cloud, but is more visually exciting. Clicking the tags can be a little hard (depending on your speed setting) but does take you to the appropriate page :).
Note : Current version only supports categories cloud.
follow steps in readme.txt.
Original awesome code for WordPress is done by Roy Tanck (www.roytanck.com), ported to Pixelpost by Amirali Sadeghi (www.Khatstudio.com)
Click here for working demo
Does anyone know what template the demo is using?