Sam Davidson offered a good distinction at his blog between the traditional non-profit and the emerging social ventures that do not choose to take the non-profit route.
For the first time, students can focus on what it means to build a business that is focused on multiple bottom lines, focusing on serving the community while running their operation. No longer are students forced to choose between operating a greedy business or working for an altruistic nonprofit. Now, students can live and work in that lovely overlapping Venn diagram of a place where their need to make a living can coincide and address the largest needs of the world.