Over the past decade, we have witnessed a number of breakthrough technologies emerge on the horizon. Ruby on Rails (RoR) is one such technology that has raised the bar for application development. Originally extracted by the Danish programmer David Heinemeier Hansson, RoR has matched wits with other popular programming languages. But RoR took the programming world by storm when Apple announced that it would ship RoR with Mac OS X v10.5 Leopard. Ever since that day, RoR has not looked back!