The Collaborative International Dictionary of English v.0.48:

Black book \Black" book`\ (bl[a^]k" b[oo^]k`).
   1. One of several books of a political character, published
      at different times and for different purposes; -- so
      called either from the color of the binding, or from the
      character of the contents.
      [1913 Webster]

   2. A book compiled in the twelfth century, containing a
      description of the court of exchequer of England, an
      official statement of the revenues of the crown, etc.
      [1913 Webster]

   3. A book containing details of the enormities practiced in
      the English monasteries and religious houses, compiled by
      order of their visitors under Henry VIII., to hasten their
      dissolution.
      [1913 Webster]

   4. A book of admiralty law, of the highest authority,
      compiled in the reign of Edw. III. --Bouvier. --Wharton.
      [1913 Webster]

   5. A book kept for the purpose of registering the names of
      persons liable to censure or punishment, as in the English
      universities, or the English armies.
      [1913 Webster]

   6. Any book which treats of necromancy.
      [1913 Webster]

   7. A book containing a black list.
      [PJC]

   8. A book kept by a single man, containing a list of women
      whom he calls occasionally for a social date; -- usually
      used in the phrase little black book. [jocose]
      [PJC]

WordNet (r) 3.0 (2006):

black book
    n 1: a list of people who are out of favor [syn: blacklist,
         black book, shitlist]