The Life of Hazrat Ali Ibn-e-Abi Talib - Excerpts from the book 'Hadrat Ali, RA' by Prof Masud-ul-Hasan. Includes a biography, assessments by Muslim and Western writers, and collected sayings. - http://www.muslim-canada.org/hadratali.htm
Imam Ali - A collection of Shia resources about the First Imam; some are devotional or philosophical, some more historical. - http://al-islam.org/topical.php?sid=305657393&cat=90
Ali - Article in the Encyclopedia of the Orient profiles Ali, cousin and son-in-law of the Prophet Muhammad, last Caliph accepted by both Shia and Sunni, and First Imam for the Shia tradition. - http://i-cias.com/e.o/ali.htm
The Commander of the Faithful: Ali bin Abu Talib - An online book, offering a full biography of the Fourth Caliph and First Imam, and an account of the conflict which led to the division of Shia and Sunni. - http://home.swipnet.se/islam/imamali.htm