Tag Mirror: How LibraryThing members tag antiquary's books
Explanation: This is a new twist to tagging. A normal tag cloud shows a member's own tags. Tag mirror shows how the whole LibraryThing community tags the same books. Although a tag mirror cannot be taken as fully accurate or representative, it often casts an interesting new light on the collection.
Please have patience. With 108 million tags, this involves some serious number crunching. Here is the blog post about it.