al Mahdi, Muhammed (Subscribe)
Links
Muhammad al Mahdi
http://i-cias.com/e.o/12thimam.htm
Profile of the Twelfth Imam, and beliefs about him; from the Encyclopedia of the Orient.
Imam al-Mahdi
http://al-islam.org/topical.php?sid=305657393&cat=125
A collection of articles and audio resources about the Twelfth Imam (according to traditions of the Twelvers); many are devotional, but not all.