Aspheric optics are now very common compared to, say, 10 or 20 years ago. They've even made significant in-roads into the commercial sector (the slice of the optical design world of most interest here). Every optical shop I know of has an aspheric polisher or diamond-turning machine which are pretty much in continuous operation.
AgX: The term is Free-form optics. The ability to design with them and fabricate today is roughly at the same level of development as aspheres were 20 years ago. However, they will never really see as much use as radially-symmetric aspheres except where folded optical paths are desirable (like in aerospace).