From the WorldCat.org site:
The search box The main attraction of the site is the WorldCat search box, which allows Web users to search the entire WorldCat database with the method most familiar to them: simple keywords. Search results in this public view of WorldCat are generated directly on WorldCat.org, instead of through Google or Yahoo! Search. Just as in Open WorldCat, each linked search result leads to the WorldCat information page for an individual item. There the user can enter geographic information, receive a list of nearby WorldCat libraries that own the item, and link right to a library’s online catalog record to initiate circulation activity or access electronic content directly. WorldCat.org lets users search the complete WorldCat database—not just the smaller data subsets utilized by Open WorldCat partner sites—and find materials within the collections of participating libraries.
Besides the ‘search box’, WorldCat.org offers several other advantages that may be of use in Bib Services.
Add WorldCat to your browser toolbar by using an extension! I’ve added it to my Firefox browser toolbar–it allows you to search WorldCat holdings very easily.
You can also now create links to items in WorldCat. This feature will be useful when you want to link to something in our catalogue. I’ve just created a link to the sound recording of Greatest misses! by Buddy Wasisname and the Other Fellers by using the OCLC number for this recording.
This product is still in its testing phase but it does look promising!