Speaking of Faith has done a broadcast on The Power of Fundamentalism.

In this show, host Krista Tippett explores the appeal of fundamentalism in Islam, Christianity, and Judaism, as experienced from the inside. Three accomplished men, who were religious extremists at one time in their lives, provide revealing insight into the spiritual and cultural dimensions of fundamentalism. They also discuss religious impulses which counter the fundamentalist world view and helped them break free.

I liked the question given here for reflection "Where do you draw the line between faith and extremism?" the program is nearly one hour. [via Light for the Journey]