In this blog post Tyler Cowen rejects a gold standard because of (a) the socialist calculation debate and (b) we now control central banks. (For example, I just called up Ben and insisted on price stability in '08. That was terrible, back in the days when central banks were controlled by the fat cats, and when inflation was high.)
It would be one thing if he rejected a gold standard in favor of gold as money (i.e. no gov't currency at all). But that's not his position.