Those in Our Own Backyards

Nissim Mossek (famous Israeli documentary maker) follows around Tzvi Misinai, a computer programmer in Israel, who has taken on a mission to find the tens of thousands of lost Jews now living secretly in Arab villages and Bedouin tribes in the West Bank. Many of these Jews, with names like "Muhammed" and "Aziz", have secret mezuzot, tefillin, siddurim, etc. and have mantained an astonishing amount of our halachot and minhagim. One village is probably completely descended from Bar Kochba.

Fascinating:

http://www.ireport.com/docs/DOC-279707