Achitofel 
A rabbinic exploration of the treasonous advisor's character and the reasons for his downfall.
http://members.tripod.com/~ohave/chumash/achitofe.htmJewish Encyclopedia: Ahithophel
Overview of the minister who betrayed King David from the traditional Jewish perspective, including Talmudic commentary.
http://www.jewishencyclopedia.com/view.jsp?artid=993&letter=A
Ahithophel
A Baptist sermon on the treachery of King David's advisor.
http://www.independencebaptist.org/Articles_by_Pastor_Wayne_Reynolds/athithophel.htm
Ahithophel: Time Bomb
A Seventh-Day Adventist discussion of the treasonous minister's inability to forgive King David's transgression with Bathsheba.
http://mcdonaldroad.org/sermons/02/0413gb.htm
