What the heck is dhimmitude?
It's the Islamic subjugation of Christians and Jews.
There was another excellent review of this book in the latest Weekly Standard, and another in the National Review.
Dhimmitude was a legal status given to non-Muslims living in Islamic lands. Since they were considered inferior to Muslims, dhimmis endured certain legal restrictions, like special taxes, dress codes, no second amendment rights, and other disabilities. In some Muslim countries, it still applies.
See http://en.wikipedia.org/wiki/Dhimmis.