Osama bin Laden's latest message from hiding urges Pakistanis to rise up and kill President Pervez Musharraf. But Osama has received an open letter himself--from Salman al-Oadah, one of his Saudi mentors who has publicly rebuked bin Laden spreading a culture of bloodshed and mayhem in the name of Islam. Fawaz Gerges, chair of Middle Eastern Politics at Sarah Lawrence College, has just returned from a sabbatical in the Middle East where he was visiting professor at the American University in Cairo.