Progress in the development of intense, pulsed ion sources is described. The major impediment, electron breakdown, can be solved by magnetic insulation of the accelerating gap or reflex geometries. Both magnetic insulation and the reflex triode have been used successfully at Cornell to efficiently generate multikiloampere ion fluxes. Scaling of these devices to the range of parameters attained by pulsed electron machings (MA in the MV range) appears feasible. Such ion beams may have applications in plasma heating, ion ring production, thermonuclear pellet compression, and other areas of physical research.