<i>I've always heard the term "whirling dervish" and never understood it.</i>
And you still don't. Sufism/dervishes and this picture are totally unrelated.
<i>It turns out that "dervish" is a Muslim sect especially in Turkey and Iran/Iraq. It's a fanatical sect (of Islam? surprise), a branch of the Sufi Islam which seems to be a bit more peaceful than the others (not a reach). </i>
Sheer idiocy on your part. "Dervish" is not a sect, it is simply a word meaning "student". Instead of showing the world what a moron you are, you might consider consulting an encylopedia once in a while.
The sufis are not a sect either; sufism is simply a spiritual dimension of mainstream Islam. To say sufism is fanatical is like saying 'psychology is a cucumber'. If you would like to learn about American sufi practioners (including the real Whirling Dervishes), check out
http://www.sufism.org
Anyhow, I just have to point out for those that don't know: You are really, really dumb. Really. You remind me of Cliff Claven from Cheers-- making up things as you go along, in a futile attempt to look like you know something.