How good of hedge is gold?

Market.view | A fine and fickle friend | Economist.com: "A recent paper...attempts to answer this question—or, rather, it attempts to answer two questions. Does gold usually move in the same direction as shares or government bonds? (In other words, is it a hedge in normal times?) And does gold move in the opposite direction when shares or bonds are falling sharply? (Is it a safe haven in extreme