The U.K company SPR(Satellite Propulsion Research) is making headway with its propellantless EmDrive technology. According to SPR their technology requires no new physics, just a new use of current understanding, e.g. using microwaves with a resonant cavity or bottle and a special waveguide. So far they have been able to decrease their object's apparent "mass" by 2g, but they believe that in further iterations they may be able to lift entire craft, making many dreams of flying cars and easy transport to space a reality.
