Muhammad (Peace be upon Him) - A substantial collection of articles on the life, teachings, and significance of the Prophet Muhammad. Includes a question and answer section. [Turkish, Russian and English] - http://www.lastprophet.info/en/
The Prophet Muhammad - Life and Teachings - A collection of articles and audio resources about the life and teachings of Muhammad, from a Shia perspective. - http://al-islam.org/topical.php?sid=305657393&cat=89
Biography of Prophet Muhammad (pbuh) - Biography of Prophet Muhammad with links to comparative religion. His name and life events were prophesied in the Bible, Vedas, Puranas, and Dasatir. - http://www.cyberistan.org/islamic/muhammad.html
Prophet Muhammad - An article which explores the significance of Muhammed in history. - http://members.rediff.com/razaelahi/muhammad.htm
Prophet Muhammad (saas) - A collection of resources about the Prophet Muhammad; includes biographies written by Muslim and non Muslim, and articles on prophethood. - http://www.usc.edu/dept/MSA/fundamentals/prophet/