WP-Cumulus allows you to display your site's tags, categories or both using a Flash movie that rotates them in 3D

A WordPress plugin that interacts with an instance of the Solr search engine. This plugin allows you to index pages and posts, perform advanced queries and enable faceting on fields such as tags, categories, and author. Adds special template tags so you can create your own custom result pages to match your theme. Configuration options allow you to select pages to ignore, features to enable/disable, and what type of result information you want output.