SpaceX successfully launched the Jason-3 environmental satellite from Vandenberg Air Force Base this morning. The second stage and the satellite are now in a coast phase in a nominal orbit.
SpaceX says the first stage landing on an off-shore barge failed. The stage landed hard and might have broken one of its landing legs.
UPDATE: The second burn of Falcon 9 stage went as expected. The satellite has been successfully deployed into the planned orbit.
UPDATE No. 2: Elon Musk says that one of the landing legs was not fully hinged into position and collapsed after landing.