With more than fifty million viewers, Al-Jazeera is one of the most widely watched news channels in the world. And it's one of the most controversial. Set up by the maverick Emir of Qatar, Al-Jazeera ('the Island' in Arabic) quickly became a household name in the West after September 11, by delivering some of the biggest scoops in television history, including airing a taped speech from Osama b…