A few days ago Lorcan showed a cloud of terms derived from his blog. We've just brought up a new version of WorldCat Identities, and are creating clouds of FAST headings found in records associated with each Identity. Here's an image of the cloud on Lorcan's Identity page:
Clicking on the cloud above takes you to Lorcan's Identity page where the cloud lives, and clicking on the terms in the live cloud there takes you to pages such as this one on Digital libraries. We're still working the bugs out of some of these pages, so they may change over the next few days. We currently have about 1,800 pages for genre clouds (e.g. Love stories) and over a million subject cloud destinations. There is some overlap between the 'subjects' and the 'genres' which we are still trying to understand and rationalize.