Isaiah - Article about the Biblical prophet from an 1897 Christian source. - http://en.wikipedia.org/wiki/Isaiah
Jewish Virtual Library: Isaiah - Detailed profile of the prophet, with links to pertinent Torah passages. - http://www.jewishvirtuallibrary.org/jsource/biography/Isaiah.html
Prophecies of Isaiah - Twenty-one of the prophet's predictions, with biblical links and discussion about their fulfillment from a Christian perspective. - http://www.aboutbibleprophecy.com/isaiah.htm
LDS Scriptures: Isaiah - The prophet's role in the Book of Mormon and importance to LDS thought. - http://www.lightplanet.com/mormons/basic/bible/isaiah_eom.htm
The Isaiah Problem in the Book of Mormon - A critical analysis of Isaiah's role in the LDS holy text. - http://www.shields-research.org/Books/Sperry/Spry_Isa.html
The Ascension of Isaiah - Discussion of this book of Jewish and Christian apocryphal texts about the life of the Biblical prophet. - http://www.jewishencyclopedia.com/view.jsp?artid=263&letter=I
Jewish Encyclopedia: Isaiah - Overview of the Hebrew prophet from the traditional Jewish perspective, including apocrypha and Talmudic commentary. - http://www.jewishencyclopedia.com/view.jsp?artid=261&letter=I
Catholic Encyclopedia: Isaias - Commentary on the Biblical prophet from the traditional Catholic perspective. - http://www.newadvent.org/cathen/08179b.htm