  We calculate the electrical and thermal conductivities and the thermoelectric
coefficient of a class of strongly interacting 2+1 dimensional conformal field
theories with anti-de Sitter space duals. We obtain these transport
coefficients as a function of charge density, background magnetic field,
temperature and frequency. We show that the thermal conductivity and
thermoelectric coefficient are determined by the electrical conductivity alone.
At small frequency, in the hydrodynamic limit, we are able to provide a number
of analytic formulae for the electrical conductivity. A dominant feature of the
conductivity is the presence of a cyclotron pole. We show how bulk
electromagnetic duality acts on the transport coefficients.
