Roy Tanck’s 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. Clicking the tags can be a little hard (depending on your speed setting) but does take you to the appropriate page. The sources code is from subversion. It is developed from a cool site called Tweet3D for Twitter. You can find it here: http://tweet3d.com/. This is one of my favorite WordPress plugins of the year!