Photo of the Day: Egyptian President Hosni Mubarak Resigns

The planet hasn't seen a political capitulation with such widespread repercussions since Germans tore apart the Berlin Wall with hands, feet, and hammers more than three decades ago. Repressive heads of state from Yemen to Iran are probably watching the jubilant crowds in Cairo, considering their own teetering reigns, and wondering if the entire region is on the brink of sweeping reform.

But while the fall of the Berlin Wall was universally viewed as a harbinger of opportunity and hope to European nations hunkered beneath the Soviet's shadow, the end of Mubarak's autocratic reign opens up speculation on any number of possible futures for Egypt—and the region.