Abigail the Carmelitess - The Biblical story of David and his second wife, from the King James translation. - http://www.topical-bible-studies.org/48-0073.htm
Abigail - Biblical biography of the politically astute second wife of David. - http://www.execulink.com/~wblank/abigail.htm
Jewish Encyclopedia: Abigail - Overview of King David's second wife from the traditional Jewish perspective, including apocrypha and Talmudic commentary. - http://www.jewishencyclopedia.com/view.jsp?artid=279&letter=A