Signature Marketing Network Launches Family Entertainment Promotions   Signature Marketing Network has launched Family Entertainment Promotions with over 250 Christian retailers featuring New, Bestselling and Sale CDs and DVDs every month, bringing in customers wanting to buy the music and movies showcased in the media.  Signature Retailers are now featuring Family Entertainment Promotions, along with the very best Books and Bibles with savings to 70% on a record 1,300+ monthly endcaps nationwide, supported by customized in-store signage, online features and email…