There is rarely a glut of good news coming out of Afghanistan, but of late optimism has been in particularly short supply. On Monday, Hamid Karzai handed over the reins of power. The good news is that the transition has been relatively peaceful, indeed the first peaceful handover of power in Afghanistan for many decades. The bad news is that what replaces Karzai is a deeply unstable coalition, led by two men who do not like each other, and whose interests are in many cases directly opposed. Few in Kabul give the new arrangement any staying power, for almost as much divides the coalition partners as brings them together.