LibraryThing for Libraries has added a new feature to our Tag Browser, showing tag clouds for an entire library. Available in different “resolutions” (up to 1,000 tags), they give a nice overview of “what’s out there” in a library’s collection, and provide quick entry points to the lists for each tag.
Update: Here’s an example at the Spokane County Library System
LTFL libraries can turn the feature on and off in the Tag Configuration page. Libraries can jump right to the tag cloud with a link like:
<a href="#" onclick="LibraryThingConnector.widgets.tags.showTagCloud(); return false;">asd</a>