Tyco International did it last year -- splitting into three companies after CEO Ed Breen admitted the Princeton-based conglomerate was worth more in pieces.
  Unisys is under pressure to do it -- taking major shareholder Clay Lifflander onto the board last week after he urged management to separate the company's government-contracts business from its tech business. 
  Should General Electric have to do it too? Is it enough to get out of the washer-and-oven business? The Washington Post's Steven Pearlstein says Wall Street is pushing too hard, read his column here.