Tag Clouds
Answer Garden
A minimalistic feedback tool. Use it in the classroom as a lesson starter to establish student knowledge or to share ideas. When completed, embed it on your website or blog to use it as a poll or guestbook.
WP-Cumulus
Fascinating tag cloud is a Wordpress plugin that allows you to display your site's tags, categories or both using a Flash movie that rotates them in 3D. See also the Flickr clouds.