At the close of 2006 , the stock market value of Google ranked third among U.S. corporations, trailing only Microsoft and Wal-Mart. Google continues to expand. It's service to achieve its goal of making all the information in the world available online.Google Book Search, for example, aims to have searchable versions of millions if books online,including rare books from university library collections. Google Earth offers up-close satellite photographs of the entire planet. To expand its click-through advertising income, Google had made deals to provide search and advertising for Time Warner's America Online and New Corp.'s popular MySpace.And in October 2006 Google announced its purchase of YouTube,the popular online video site,for 1.75 billion