Heather Mills, the ex-wife of Beatle Paul McCartney, is considering filing suit against Rupert Murdoch's London tabloid News of the World after learning that her voicemails had been tapped by a private detective working for the newspaper, Britain's Guardian newspaper reported today (Friday). The Guardian observed that Scotland Yard has shown Mills evidence that her voicemail was tapped around the same time that her four-year marriage to McCartney was ending. In May 2006, News of the World was the first newspaper in the U.K. to reveal that Mills had moved out of McCartney's home