And here's a fascinating looking video on the same subject. It's 40 minutes long, so I'll probably give it a look tomorrow (Sunday) if I find time. Here's the blurb:
In 1945 there were up to one million Jews living in the Middle East and North Africa outside the Palestine Mandate - many living in communities dating back more than three millennia. Today, there are several thousand. Who are these Jews? What precipitated their mass-exodus in the 20th century? Where did they go? And why don't we know their stories?
Oh, and on this issue, see Bernard Lewis' relevant article.