WaPo:rising Sunni-Shiite tensions central dynamic of today's Middle East

The Post has a mustread story today by Anthony Shadid on a subject we've been focusing on for some months now: how our policies have unleashed a new dynamic in the Middle East that is fundamentally changing the region's politics:

The growing Sunni-Shiite divide is roiling an Arab world as unsettled as at any time in a generation. Fought in speeches, newspaper columns, rumors swirling through cafes and the Internet, and occasional bursts of strife, the conflict is predominantly shaped by politics: a disintegrating Iraq, an ascendant Iran, a sense of Arab powerlessness and a persistent suspicion of American intentions. But the division has begun to seep into the region's social fabric, too. The sectarian fault line has long existed and sometimes ruptured, but never, perhaps, has it been revealed in such a stark, disruptive fashion.