While the resupply mission has become routine, the Saturday mission will also attempt to land the first stage of the Falcon 9 rocket on an ocean platform (shown above). If successful, we are seeing the first of what should be many more reusable rockets.
SpaceX continues to push the private sector industry to new heights, though it has plenty of battles back here on the surface. For instance, it still has a lawsuit against the Pentagon concerning competition for rockets and now the Air Force has delayed its clearance of SpaceX rockets for such competition by another 6 months. It makes the vacuum of space look enticing.
Update: Earlier Saturday the launch to the space station was a success but the platform landing of the first stage of the Falcon 9 rocket failed. SpaceX is not discouraged and testing will continue.