OCLC and Yahoo! have officially launch a free co-branded toolbar that provides one-click access to Open WorldCat as well as Yahoo! Search's Web search engine. The free toolbar plugs into Microsoft's Internet Explorer browser. A whirligig OCLC logo to the extreme left on the toolbar clicks to a subset of Open WorldCat (currently 2 million of the 57 million records available in the full WorldCat, reflecting the holdings of some 9,000 libraries). In time, the click-through will access more-perhaps all-of the WorldCat database, as Yahoo! begins to "harvest" the full file now offered by OCLC