Bat Ye'or is an author I first came across browsing through book reviews in First Things. I think her work is attracting more attention since 9/11. The main thesis boils down to this: the idea that Muslim rulers in the past were tolerant of their subject populations—especially their Christian and Jewish subject populations—is a myth. This was something I recall being taught and reading in college. Ye'or, an exile from oh-so-moderate Egypt, has written several papers, books and given several lectures to puncture this myth. Her web site can be found here. Check it out.