The NFL Network is providing one week of free programming from December 24-30th. NFL.com likens it to HBO or Showtime having a free preview weekend. Of course, during that weekend, HBO doesn't black out programming like the NFL Network will for the Saturday night game between the New York Giants and Washington Redskins. Which means we'll have the same programming that's keeping the demand for it relatively low.
NFL Network offering free week [NFL.com]