Google is expanding its already far reaching clutches into other advertising.  Google Inc. has started testing a radio advertising service that represents the Internet search leader’s attempts at expanding its financial clout beyond the Web.  Announcing Thursday that it will help sell advertising on more than 700 radio stations in more than 200 U.S. metropolitan markets, the Mountain View, California based Google hopes to eventually sign up more than 5,000 stations, according to documents shown to potential advertisers.

Source: The Associated Press