This is so exciting.  Not quite a moon landing, but still feels like watching a significant moment in history.<p>Does anyone know what specifically changed to allow a landing attempt on land as opposed to barge?  Was it just that they gained enough confidence with the barges that they would at least be able to hit the target (and not crash into a building or something), or was some regulatory clearance received or something?  Or something about this launch (ie lighter payload?) made a return to land feasible?