Jewish Encyclopedia: Book of Malachi 
Overview of the prophet from the traditional Jewish perspective, including rabbinic commentary.
http://www.jewishencyclopedia.com/view.jsp?artid=102&letter=MCatholic Encyclopedia: Malachias
Commentary on the Biblical prophet from the traditional Catholic perspective.
http://www.newadvent.org/cathen/09562b.htm
Malachi
Profile of the prophet from a joint Lutheran and Catholic bible study project.
http://www.aboutbibleprophecy.com/p42.htm
Book of Malachi
The text of the Biblical chapters in Hebrew and English.
http://www.hareidi.org/bible/Malachi.htm
Tzaddikim: Malachi
Presenting a collection of Chassidic beliefs about the prophet.
http://judaicaplus.com/Tzadikim/malachi.htm
The Minor Prophets: Malachi
Historical and spiritual overview of the Biblical prophet.
http://www.zianet.com/maxey/Proph13.htm
