See, for example, the (current) page for Information rules. I like the way it highlights subjects and other editions. IMHO one of the major features of OpenWorldCat is the way it is beginning to release the value of the accumulated investment by libraries in structured data more effectively on the open web. Under the other editions tab we bring together various manifestations of a work using the FRBR algorithm. Under subjects, we allow readers to follow subject threads back into the index.
There is still much that could be done, and we will be improving these areas as the service develops: a part of making data work harder in richer browsing experiences.