In specially designed solid microcavities, the photon properties can be altered to have effective mass and repulsive interactions; these new states are called "polaritons". The polaritons act like atoms, and because they are bosons, they can undergo Bose-Einstein condensation. The experiments on polariton condensation have shown truly remarkable progress in recent years, with new results showing superfluidity and quantized vorticity in a ring geometry. I will review the state of the art in the field, including results from our lab in Pittsburgh which show quantized vorticity, and measurements of the phase diagram for the polariton condensation.