A tagcloud is a visual representation of commonly used tags where those tags that are used more frequently appear larger and bolder than those used less frequently.

The tagcloud at http://tags.library.upenn.edu represents the most commonly used tags in Penntags. Clicking on a tag in the tagcloud will take you to ALL posts in Penntags with that tag.

Individual tagclouds also appear on each owners page i.e. at tags.library.upenn.edu/pennkey These tagclouds represent the tags used by that owner. Clicking on a tag in that tagcloud will take you to all posts by that owner with that tag.