Yusuf Qaradawi, the Sunni scholar and spiritual mentor of Muslim Brotherhood-types across the Umma, has some pretty atrocious things to say about Jews. I was not fully aware of his theological antisemitism until I started digging around. I'll post on this more once I finish reading some of the source material, but in the meantime Andrew is grappling with the subject admirably:
"(Qaradawi's) anti-Semitism? Really, appallingly awful. And, alas, not that exceptional everywhere in the region. My hope, of course, is that this sickness abates in more open societies where the rulers do not deploy anti-Semitism as a tool to keep themseves in power. My fear is that it has become so ingrained in Arab and Muslim culture that it endures; and that religiously influenced parties will deepen it.