CHICAGO (Standard&Poor's) Dec. 15, 2008--Standard&Poor's Ratings Services today placed its ratings on Liberty Media Corp., including the 'BB+' corporate credit rating, on CreditWatch with negative implications. The CreditWatch placement is based on the company's plan to distribute a majority of its Liberty Entertainment tracking stock assets to existing Liberty Entertainment tracking stockholders through the split-off of a newly formed subsidiary, Liberty Entertainment Inc. "The CreditWatch listing highlights the risk and uncertainty surrounding the company's future business strategy and capital structure," noted Standard&Poor's credit analyst Andy Liu. The transaction would be effected as a pro rata redemption of a portion of the outstanding shares of Liberty Entertainment tracking stock in exchange for all of the