To everyone looking for expiring/dropping domain lists, ive been building an app called dropparser that uses a free source (though I dont see it being mentioned in here yet). Some python code for you:

  domain_file_url = "http://www.odditysoftware.com/download/dldoms.php?domdate=

  def today():
      return str(datetime.date.today())

  def get_raw_domain_file():
      return urllib2.urlopen(domain_file_url + today()).read()